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How do i wire my headlights to my battery without using a relay switch

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  • Expert
  • 103 Answers

You should not bypass factory systems. Replace relay as needed to correct the problem.

Posted on Jan 21, 2013

5 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

chiquititas
  • 1010 Answers

SOURCE: Ford E450 - Headlight problem.

are you talking about the headlight? theres a knob

Posted on Jun 23, 2008

VulcanBrat
  • 23 Answers

SOURCE: Headlights don't work. Need wiring diagram for

Easy as pie..
Go to Autozone.com. Register yourself... it's FREE
Type in your vehicle info... year, make, model, eng..
Go to repair guides section. It's all there. PLUS you'll get the costs while you're on the site!

FYI: if you're not registered, you can't view guides and manuals.

Posted on Feb 03, 2010

  • 1374 Answers

SOURCE: headlights have gone on without prompting

Any thing is possible. But I would start with a defective switch. Relay does what switch tells it to do.
Regarding Engine Control Relay usually hot at all times looks like you did a reverse battery drain test.
So far either headlight switch or relay and ECU relay.
This takes most techn's one hour to do .
After you finish testing the light switch and relay do the following test to make sure nothing else is draining your battery.
Remove the negative battery cable from its post and connect an ammeter red probe
to the negative battery post and the black probe to the negative battery cable.
Now start pulling fuses until the voltage on the meter returns to normal.
(anything above a half of a volt is too high) The fuse you pulled to get this
result is the affected circuit. Now you have to probe it from its B+ source to
the load
to find the short. Check all connectors for rust and the line for opens or
shorting to ground. Repair accordingly.

Posted on Apr 14, 2010

  • 117 Answers

SOURCE: I have a 2001 cavalier with a dim driver side

Give this a try------get a piece of wire and strip both ends, the black wire coming out of the plug on the head light, stick one end of the wire in there and the other end to a good ground or the negative battery terminal with the lights on, if the light gets brighter, there is a bad ground to that light. I hope this helps, cause you have just done about everything else.

Posted on May 15, 2010

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As soon as I turn headlights on it blows the fuse for gages on dash no wires touching and lights don't come on gages work if I don't turn headlights on


Hi Bobbi
A 50w Headlamp will draw 4 Amps (Ohms Law 50/12=4.1)
So... 2 Low beams will draw 8 Amps.
Obviously more for high beam and high wattage Quartz Bulbs.
That is a lot for a small switch (contacts) to handle.
This is why a lot of vehicles use a Relay to power the Headlamps.
The relay is connected directly from the Battery to the Headlamps.
The large internal contacts can handle the higher current (30A) and the dash headlight switch connects to the magnetic coil inside the relay and is only used to pull the contacts closed.
Does your circuit include a relay.? Do you hear a relay click?
simple headlight relay wiring

To assist with your troubleshooting, try disconnecting one head lamp bulb to reduce current load. Does the fuse blow?
A temporary12v circuit breaker could be substituted for the fuse until you determine the problem.


If the circuit is using a relay then there will be a fat wire going from the battery to the Relay. The fine wire on the relay input is the trigger. A 12v test lamp is really useful for troubleshooting around the car. Also a cheap multimeter. Clamp style current meter is also handy to see exactly what current is blowing the fuse

Relays

http://www.ebay.com.au/itm/NARVA-CIRCUIT-BREAKER-REPLACES-STANDARD-BLADE-FUSE-BATTERY-15A-AMP-12V-55715-/321234642731?hash=item4acb13a72b
There is a 10A circuit breaker also like above

Automotive Circuit Breakers Wiring Products

Sep 13, 2015 | Cars & Trucks

1 Answer

Headlight wiring diagram


Honestly, there simply not much difficulty to the way headlights are wired on any vehicle. Standard headlights receive positive 12v from the headlight switch directly (or through a relay, if you have automatic headlights), and the switch receives power through the fuse block from the battery. When you turn the headlight switch on, you should get 12v at the input connector to your headlights. If the headlight connector is not receiving +12v at the connector when you turn the headlight switch on, check the fuse, the switch, and the relay. If the headlight assembly is receiving +12v at the connector, check the bulb. If the bulb tests good with an ohmmeter, check for a broken ground wire. That is simply all there is.

Jun 24, 2014 | 2000 Mitsubishi Galant

1 Answer

2001 chevy impala overhead light wont turn off


see this steps and fix it use the VOM or DVOM. God bless you
The Cause: Most likely no voltage to the headlights because of a bad headlight relay, fuse, module, headlight switch, dimmer switch or wiring fault.
To figure out what's causing your problem, start by inspecting the main fuse for the headlight circuit. See your Owners Manual for the location of this fuse. It is often located in the power center in the engine compartment, but may also be in the fuse panel under the dash.
fuse1b.jpg If the fuse has blown, replace it with a new fuse (same amp rating) and try again. If the fuse blows immediately, there is a short in the headlight circuit that will have to be found and repaired before the headlights will work. If the fuse does not blow and the headlights work, problem solved (for now). There may be in intermittent short or overload that caused the fuse to fail.
If the fuse if okay, use a volt meter or 12-volt test light to check for power at the fuse. Most headlight circuits are on (powered) all the time, so there should be voltage to the power side of the fuse. No power at the fuse would indicate a wiring fault possibly in the fuse block or in the wiring between the fuse block and the battery. You'll need a wiring diagram to trace the wiring circuit and find the fault.
relay_1a.jpgIf the fuse is okay and there is power, the next check would be to find the headlight relay or control module. If the system uses a relay, pull it out and shake it. If anything inside rattles, replace the relay. Or buy another relay and plug that in to see if that restores power to the headlights.
On systems that use a module control module or daytime running lamps, about all you can do is eliminate other possibilities such as wiring faults, a bad relay or headlight switch first. If the module is getting power when the headlight switch is turned on, but the headlights fail to come on, the problem is likely a bad module. The module may be located in the front area of the engine compartment (common on Fords), under the dash or elsewhere in the front of the vehicle. You will probably need to refer to the vehicle service literature to find the module's location.
If the headlight relay or module do not receive voltage when the headlight switch is turned on, a bad switch is your problem. Switches get a lot of wear and tear, so it's not unusual for a switch to wear out after many years of service. Replacing a headlight switch can be difficult depending on whether is it located in the instrument panel or on the steering column.
If your headlights work on low beam, but you have no high beam, or they work on high beam but there is no low beam, the most likely cause is a bad dimmer switch. The dimmer switch is integrated into the steering column mounted headlight switch on most vehicles, so if the dimmer is not working, you will have to replace the entire switch.
DO NOT attempt to replace a steering column mounted headlight switch without first disconnecting the battery and waiting at least 20 minutes for the capacitors in the airbag circuit to discharge. The steering wheel will have to come off to replace the switch. Crossing up the wrong wires in the steering column could set off the air bag and cause personal injury.
If a headlight switch looks like it will be difficult to replace, don't try to do it yourself. Take your car to a dealer or repair shop and have them replace the switch for you.

Oct 16, 2012 | 2004 Chevrolet Impala

1 Answer

How do I change out the head light switch on 1992 geo storm


The headlight switch on this car may be changeable, but are you having a problem with the headlights working at all?

If so, then the following may be helpful:
---
REMOVAL & INSTALLATION Spectrum The headlight control switch is a 3 position, push type switch which is located at the left side of the instrument panel.
  1. Disconnect the negative battery cable. Remove the instrument cluster bezel retaining screw and the bezel.
  2. Disconnect the electrical connectors.
  3. Place the bezel on a bench and remove the 2 nuts securing the headlight control switch.
  4. Remove the headlight control switch.
  5. To install, reverse the removal procedures.
Storm The headlight control switch is located at the left hand side of the instrument panel on the meter hood.
  1. Disconnect the battery negative cable.
  2. Remove the meter hood.
  3. Remove the instrument cluster from the meter hood.
  4. Remove the 2 clips attaching headlight control harness.
  5. Remove the 4 screws attaching the headlight switch to the meter hood.
  6. Disconnect electrical connectors from the switch and remove the switch.
  7. Reverse procedure to install. Connect battery negative cable.
prev.gif next.gif ---
SWITCHES & RELAYS Switches are used in electrical circuits to control the passage of current. The most common use is to open and close circuits between the battery and the various electric devices in the system. Switches are rated according to the amount of amperage they can handle. If a sufficient amperage rated switch is not used in a circuit, the switch could overload and cause damage. Fig. 1: The underhood fuse and relay panel usually contains fuses, relays, flashers and fusible links tcca6p02.jpg
Some electrical components which require a large amount of current to operate use a special switch called a relay. Since these circuits carry a large amount of current, the thickness of the wire in the circuit is also greater. If this large wire were connected from the load to the control switch, the switch would have to carry the high amperage load and the fairing or dash would be twice as large to accommodate the increased size of the wiring harness. To prevent these problems, a relay is used. Relays are composed of a coil and a set of contacts. When the coil has a current passed though it, a magnetic field is formed and this field causes the contacts to move together, completing the circuit. Most relays are normally open, preventing current from passing through the circuit, but they can take any electrical form depending on the job they are intended to do. Relays can be considered "remote control switches." They allow a smaller current to operate devices that require higher amperages. When a small current operates the coil, a larger current is allowed to pass by the contacts. Some common circuits which may use relays are the horn, headlights, starter, electric fuel pump and other high draw ciruits. Fig. 2: Relays are composed of a coil and a switch. These two components are linked together so that when one operates, the other operates at the same time. The large wires in the circuit are connected from the battery to one side of the relay switch (B+) and from the opposite side of the relay switch to the load (component). Smaller wires are connected from the relay coil to the control switch for the circuit and from the opposite side of the relay coil to ground tcca6g02.gif
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Sep 13, 2010 | 1992 Geo Storm

1 Answer

Headlights have gone on without prompting


Any thing is possible. But I would start with a defective switch. Relay does what switch tells it to do.
Regarding Engine Control Relay usually hot at all times looks like you did a reverse battery drain test.
So far either headlight switch or relay and ECU relay.
This takes most techn's one hour to do .
After you finish testing the light switch and relay do the following test to make sure nothing else is draining your battery.
Remove the negative battery cable from its post and connect an ammeter red probe
to the negative battery post and the black probe to the negative battery cable.
Now start pulling fuses until the voltage on the meter returns to normal.
(anything above a half of a volt is too high) The fuse you pulled to get this
result is the affected circuit. Now you have to probe it from its B+ source to
the load
to find the short. Check all connectors for rust and the line for opens or
shorting to ground. Repair accordingly.

Apr 14, 2010 | 2001 Saturn L-Series

2 Answers

I want to install aux. backup lights and not wiring them to the jeeps backup ligts. I don't understand the switch. It has three prongs on the back The diagram shows one is power coming from the relay one...


What diagram? What switch? Are you using a switch that salready in the Jeep, or a switch that you bought? You really need a relay to handle th ecurrent of the lights. The relay will have 4 terminals, The relay is really just a remote switch. Let the relay take the power, not the switch. Buy a relay for fog lights and it should have a diagram you can use.

Dec 19, 2009 | 2004 Jeep Wrangler

1 Answer

Intermitenly my headlights flash on and off.i already replaced the headlight switch. nothing noticeably consistant like bumps are causing this problem. just happens some times. increments are on and off...


Check if a relay exists, and if so, the contacts within could be arc damaged enough to cause intermittent failure (each time they open is a chance for arcing). Likewise, a potential arc failure site is the dimmer switch on the steering column.
...Could check if problem is up-system from the relay (if uses a relay), by placing a jumper wire (from battery or positive source) to the low current connector of the relay (which would be coming from the dashboard/column switching), in order to lock the relay to "on" (as if the interior light switch was now perfectly on).
...Similarly can check if relay by jumping across high current leads (should have the thicker wires that go from battery to relay and then high current lead of relay to headlights)

Aug 09, 2009 | 1994 Dodge Ram

3 Answers

96 Dodge Ram 1500 wiring diagram for headlights.


Here's a link to a pdf file containing the headlight wiring diagram for your year model Dodge Ram 1500..
I can't help but notice that you say you've replaced the headlight relay? That's quite odd, because there is NO headlight relay on this vehicle- only a 40 amp fuse located in the power distribution box that sits behind the battery inside the engine bay.
The switch is notorious for burning out because there is NO RELAY on this vehicle, and there is a recall (#819) but this only affects 3500 models even though the headlight wiring is the same for 1500,2500 and 3500 model Rams.
Here are two more links that will help you troubleshoot your headlights problems.
HereInformation on Putting a Relay in the Wiring System

Mar 07, 2009 | 1996 Dodge Ram 1500 Club Cab

1 Answer

98 ford taurus headlights will not go off


either the headlight relay is stuck on. or the daytime running light module or relay is bad. to confirm find the relay center and switch the headlight relay out with another relay with the same part# on it. there should several in the relay center with the same part #. If this fixes the problem get a replacement relay. if not try switching out the relay for the daytime running lights. if no dice then unplug the daytime running light module.

mike

Jan 06, 2009 | 1998 Ford Taurus

1 Answer

No headlights


I am not much of a mechanic any more ,but I do have some experince with electronics and for any circuit to operate battery has to flow to ground.Direct battery to ground will blow a fuse or melt your wiring if the fuse does not blow.If your parking lights stay on all the time then there is a complete path from battery to grd through the lights,and it sounds as though what ever is causing the problem on the parking lights is killing the path to your lamps relay.A wiring diagram may be available on the internt or library.Good luck.

tk46

Jul 11, 2008 | 1999 Dodge Grand Caravan

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