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Relay not work

Circuit wire burn

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  • Danny Clark
    Danny Clark May 11, 2010

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Neither headlights working or fog lights any ideas please

First check for blown fuses (a blown fuse indicates there is a short in the lighting circuit ) and check any defective relays. When vehicles are operated with the fog lights on all the time this causes the wiring for the associated circuit(s) to operate at a higher temperature and eventually it will result in a burned out non-conductive connection. Usually the wire(s) burn out where they are connected to switches, at the headlamps, fog lamps etc... Also check for a burned out connection or a melted terminal contact board used for the high beam-low beam switch which is usually located inside the steering column.
Good luck.

Oct 29, 2014 | 2005 Renault Megane Scenic

1 Answer

P0685 fault code uk ford

p0685 refers to ECM power relay control---circuit open===causes--wiring--ECM relay
Replace this relay. Check the wiring from the coil to the distributor as there is a dead short after the coil somewhere for the fuse to blow and the coil to overheat.. You may have a electronic module failure either in the distributor or the ECM

Dec 31, 2013 | Chrysler Cars & Trucks

1 Answer


Sounds like there is a significant short in the circuit, often is the harness that the bulb itself plugs into. Look for frayed wires, loose wires, burn marks on the contacts of the buld and/or the harness. With no bulb in the suspected harness, does the other headlight continue to work? If not the circuit short is closer to the relay, and not at the headlights themselves.

Also if the highbeams work, and you see the DRL light flash, is indicating there is a bulb out, and not an issue with the DRL relay itself.

Dec 06, 2013 | 2008 Chevrolet Equinox LS

1 Answer

Kia sedona 2002, ABS light always blink for about a second or two almost every day and shortly after my headlights burns out. Please, can someone help me out? I am tired of buying bubs.

It is possible that your alternator is overcharging/sending too much electricity to the headlights, the headlights are most likely on a different circuit than the other electrical circuits. Usually they have there own circuit because they use so much power, There is usually a relay circuit that works (like a solenoid) which connects the larger wire together. Also if the relay or solenoid is bad then maybe the lights are flipping on and off and it blows the blubs. Also it is possible that you have a short in the wiring which goes to the bulbs which causes power fluxuations which blows the bulbs. Are you sure the bulbs actually burn out? Or do you replace them in the daytime after they burnout or go off at night driving. You also have a Circuit breaker which can cut the lights off, then perhaps after the car shuts off and cools down a few hours it resets and works again, again this would be a sign of a short OR your using the wrong size or wattage bulbs which takes more electric than normal for the circuit breaker.

Oct 12, 2013 | 2002 Kia Sedona

1 Answer

Wiring multiple lights to one switch

I will suggest wiring a relay or even a number of relays into the circuit. Most switches can't handle high current flow so use the switch to operate the relays. You can wire in an almost countless number of lights without fear of burning out the switch. Draw out a diagram to be sure that you are staying within the operating limits of the relays, wires and connectors that you're using. You can also do the math to figure out which relays will work best for your application/requirements. If you'd like more help, please forward specifics about your components and what you're trying to accomplish and we'll build even more! :D

Jan 17, 2012 | Cars & Trucks

2 Answers

Where is the relay located for the code P1491? On a 2000 jeep grand Cherokee?

Hi there:

DTC P1491 is for the cooling fan relay control circuit as you've found already. Start by checking the fuse for the fan relay. Its in the box under the hood, a 40 amp fuse.

If you've got a couple jumper wires, you can unplug the fan connector and carefully jump the fan to see if it works. The fan connector is on the right side of the back of the fan shroud. Unplug it and jump the black wire to ground and the green to positive. You've got to be very careful doing this though-you are in very tight quarters, its not hard for your jumper wires to touch each other in the connector and short together, and if you use small diameter jumper wires they will get hot quickly when the fan comes on.

If the fan doesn't come on when you jump it, or if it runs slow or sounds bad, you've got a bad motor and will need to replace the fan assembly. One thing that does happen somewhat often, is a bad fan motor will burn up the relay. If the fan motor is drawing too much current it will overload the relay and burn it up. This is why its so important that if the fan motor runs slow or makes noise that you replace it, or you may end up burning up relays frequently.

If the fan runs and the fuse is good, its very likely you just need a fan relay. This is a pulse width modulated relay, not the on/off clicker type you'd find in the fuse box. This unit is capable of infinite speed control. It gets very hot in operation, so its mounted to the body sheet metal to allow heat to dissipate through the sheet metal. The relay is mounted under the right headlamp held down with two 8mm screws. To get to it you have to remove the front bumper cover and headlamp bracketry to access the relay. These relays are pretty common.

Check and test this possible causes:
radiator fan ctrl rly circuit wire harn intermittent defect
radiator fan ctrl rly circuit wire harn observable defect
radiator fan relay ground circuit open
rad fan relay control circuit open
radiator fan relay control circuit short to ground
rad fan control relay defective
PCM defective

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Dec 19, 2011 | 2000 Jeep Grand Cherokee

1 Answer

Hi. I have a '88 Hiace. Recently, very occasionally the headlights failed to work. If i switched the switch on and off a couple of times, they would come on. The other night, i smelt a bad electrical...

yes it will burn out again the wiring from the switch to the headlight module has a short use a voltmeter to trace it and replace wiring then put in the relay

Sep 15, 2010 | Toyota Corolla Cars & Trucks

1 Answer

Ford focus 1.8 diesel. 2001. ELECTRICAL.. lights, brake lights, windows, blower wont work. checked relays and fuses. there was a prob with starter motor solinide.. caused negative wire on battery to get...

The ECU doesn't have anything to do with lights, windows or blower on your vehicle. Fuse or burned ground wire in those circuits if far more likely. Get a wiring diagram and find the common /fuseswires to those circuits.

Jan 08, 2018 | 2001 Ford Focus

2 Answers

Headlight not working on my 1998 ford mustang

One headlight? two head lights. Head light on cars that old usually have a circuit breaker look for that

Aug 06, 2009 | 1998 Ford Mustang

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