Question about Chevrolet Suburban 1500

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Where can I safely tap 12v power to add another circuit?

I want to safely add a circuit that would draw 30 amp and be on only when the engine is running. Any ideas?

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  • knalandandca Apr 21, 2009

    Anyone know of after market plug in relays? Something to plug into the courtesy center or fuse box?

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  • Chevrolet Master
  • 1,869 Answers

Check the ignition wires with a test light and locate the wire that goes on and off with the key turned
Auto part stores sell an adaptive positive battery cable connector tap off this with #12 wire to one side of a 30A relay tap the other side (load) this goes to your device then: tap off the other side of the relay (switch) cut the wire to the ignition feed; then back to the ignition switch use #18 wire with either wirenuts or, crimp connectors for this and, don't forget to ground ask the auto parts person to show you the "load" side (your device" and, the "switch" side of the relay.

Posted on Apr 21, 2009

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How to fix no power to some fuses on fuse block 92 volvo 960


Hi Ron
Thats a tough one.... Starting behind the fuse box....

Start from the other end. All Power has to come from the Battery.
So... a main feed wire (thicker) might be open.

There is another type of fuse used on cars. They are called fusible links. Check the wires leaving the Battery Positive terminal with a MultiMeter. Or use a 12v Test Light or make one up.
There is probably an open circuit in a link cable or Circuit Breaker.

Perhaps a Relay turned on by the Ignition Key is not making contact.
Tap the relay to get the internal contacts better connected. Or remove a suspect & test with 12v to the relay coil & monitor contacts with multimeter.
Sure is easier than pulling the fuse box out
Good Luck

Relay Wikipedia the free encyclopedia https://duckduckgo.com/?q=the+hook+automotive+tester&ia=products

Jan 08, 2016 | Volvo 960 Cars & Trucks

1 Answer

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

2007 gmc sierra 1500


You have a parasitic draw. Something is drawing power while the truck is sitting. Do you have any aftermarket items hooked to direct power? Something you leave plugged in to the 12V plug (cig lighter) Some 12v plugs are full time power and some are only powered with ignition on. Any amps wired direct power? If you have no aftermarket accessories drawing constant power you then need to determine what circuit has the draw. An amp clamp on the battery cable will show draw, then re & re 1 fuse at a time until you find the one that eliminates the draw. Once you've done that you need to find the problem on that circuit. All this is assuming your charging system is working and the battery is being properly charged while you're driving the truck.

Jul 05, 2014 | 1992 Dodge Dakota

1 Answer

Interier fusebox location chrysler grand voyager


Find the fuse box behind the glove compartment door. See this video.

Most phone charger require less than an amp or two at 12 VDC so you could probably "sneak" the piggyback device in your link above on anything existing - but I'd recommend a higher value fused circuit like a 20 ~ 30 amp types. Stay away from those used for headlights, wipers, etc. Connecting to radio, A/C, Heater, etc may be a better choice. Check your manual to see if there is an accessory fuse slot designed for this purpose.

Dec 19, 2013 | 1997 Oldsmobile Cutlass Supreme

2 Answers

Add 12 volt outlet switched by ignition


maybe try getting your 12v feed from the radio power, this should be connected to the ignition switch and will run when the key is turned to accessory or the ignition is turned on

Dec 13, 2013 | 2005 Pontiac Montana SV6

1 Answer

How to make 12v DC power supply to power my winch


use a 12v car battery and a small battery charger... a winch draws alot of amps when in use... so you need the battery to supply the amperage ... 12v power supplies are low amperage output supplies... so will not work (inexpensively).

Mar 23, 2013 | Cars & Trucks

1 Answer

Underhood fusebox fuse #13 50 amp what is it for


The large MAXI fuses in the engine compartment fuse block are the MAIN fuses. They supply voltage to several other fuses or circuits.

MAXI Fuse #13 in your 1996 Ford Ranger is supposed to be a 30 Amp fuse (not a 50 Amp) according to the power distribution diagrams as well as the fuse block detail diagram. This fuse supplies voltage to the Powertrain Control Module (PCM) power relay and to the oxygen sensor heater circuits.

Please note that it is NORMAL for this fuse to cause a draw on the battery during vehicle operation and also after engine shut down. The OBD-2 oxygen sensor heater circuit monitors run after engine shut down and key off. This can take up to 45 minutes to complete. After the O2 heater monitor has run, the PCM will go into sleep mode.

When the PCM goes into sleep mode, the battery draw from this fuse will be reduced greatly. If you are performing "ignition-off-draw" tests trying to figure out why the battery keeps going dead, it is best to use an ammeter that has a 1 or 2 amp scale. You should set-up for the test using a shunt bar. Wait for 45 minutes to an hour for all of the computer systems in the vehicle to go into sleep mode, then open the shunt. Your computer memory, radio pre-sets, clock, etc. will continue to draw without ever shutting completely off. Any draw under 300 Milliamps is considered "acceptable". It is my experience that most vehicles have an ignition-off-draw of somewhere near 150 Milliamps.

The underhood fuse box diagram can be found on page 314 in the 1996 Ford Ranger Owner's Manual.
If you do not have an Owner's Manual, you can get a PDF version HERE (direct link)

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1 Answer

I cant locates side electric window fuse driver


It's position #14 in your dashboard fuse box. It's a 30 Amp circuit breaker, not a fuse. If your other windows work this isn't the problem. The circuit breaker protects ALL the window motors at the same time and will normally reset when it cools off.
If it's the driver side only a little troubleshooting here. Take the door panel off, disconnect the motor connection and see if there's 12v on the power side when you operate the window switch. If 12v is there, the gear set inside the motor is broken (replaceable parts) or the motor itself is shot, If 12v is NOT there my guess would be the switch if the other windows work.

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1 Answer

Check engine light came on,was a 15 amp fuse, replace fuce but it keeps on blowing until i put a 30 amp


which fuse is it, replacing with a bigger fuse is asking for trouble, burnt wires etc, find what is drawing hard on that circuit and repair it

May 11, 2010 | 1996 Suzuki Swift

1 Answer

Radio, clock, cigarette lighters not working


all on the same circuit. radio has two power supplys, one when the key on, and one all the time. aftermarket decks draw alot more than factory and this circuit may not be able to handle the extra load. look in owners manual and look in engine and interior fuse panels. it may say memory,clock,ecm keep alive etc. if need be check them all one is failed. now as for the engine light, most obdII vehicles use this circuit to keep computer memory alive... it will set a code for voltage lost. if you know your not overloaded or have a short, then its safe to go up to next size fuse,2.5 or 5 amp heavier. but thats it. if keeps happening you have a short or you may have to run a dedicated feed circuit for the deck. good luck youll find it

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