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Headlights wont come on after plow removed

How does bypass work for plow lights

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Posted on Jan 02, 2017

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SOURCE: I need a wiring diagram for 1987 Chevrolet 3/4 ton

The Haynes repair manuals usuall have wiring diagrams in the back of book.Around $20.

Posted on Oct 16, 2009

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stonecon360
  • 82 Answers

SOURCE: On my 1997 gmc truck when plow light switch is

This is just an idea, I may be wrong but any input is helpful, right? I would think that the switch that controls the plow lights is designed to alternate between the circuits for the truck light and the plow light. If the trucks headlight switch is turned on then the circuit is closed and turnes on the light. When the plow light switch is turned on it may cut the hot side of the circuit going to the headlight and engage the hot wire to the plow light. The headlight and plow light may share a common ground. If they don't share a common ground then the plow switch may cut the ground wire opening the circuit. If you can't find a solution you can always wire the plow lights directly to the battery with the same switch or a new toggle switch and then turn on the parking lights only on the truck. On most GM cars and trucks there is a space in the fuse pannel that is for a power accesory. It is basically a fuse slot that is empty labeled ACC. This is a 12V hot power source and you would run the positive wire here then ground the neg to the chassis. This way if you forget to shut off the toggle it will cut the hot when the key is shut off. When running the wire it is near the hood release able and you may be able to run the wire thru there and not drill a new hole. I've done this for neon lights under cars as well as stereo systems requiring an amplifier. If you drill a new hole even though its under the hood I would put a little blue RTV silicone over the new hole to prevent moisture from getting past the fire wall or road salt.

Posted on Oct 16, 2010

SOURCE: Lights on a fisher xtreme plow wont work

Check your harness plug ends for broken pins. Also the isolation module could be defective

Posted on Feb 07, 2012

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1 Answer

Meyer plow troubleshooting


Number one the plow headlights should be seperate from the vehicle. Get a new harness for the plow on ebay for cheap and have it installed. In the long run it will be cheaper.

Mar 11, 2017 | Cars & Trucks

1 Answer

On my 1997 gmc truck when plow light switch is turned on one truck headlight goes out and plow light on that side comes on but other truck headlight stays on and that plow light does not come on..


This is just an idea, I may be wrong but any input is helpful, right? I would think that the switch that controls the plow lights is designed to alternate between the circuits for the truck light and the plow light. If the trucks headlight switch is turned on then the circuit is closed and turnes on the light. When the plow light switch is turned on it may cut the hot side of the circuit going to the headlight and engage the hot wire to the plow light. The headlight and plow light may share a common ground. If they don't share a common ground then the plow switch may cut the ground wire opening the circuit. If you can't find a solution you can always wire the plow lights directly to the battery with the same switch or a new toggle switch and then turn on the parking lights only on the truck. On most GM cars and trucks there is a space in the fuse pannel that is for a power accesory. It is basically a fuse slot that is empty labeled ACC. This is a 12V hot power source and you would run the positive wire here then ground the neg to the chassis. This way if you forget to shut off the toggle it will cut the hot when the key is shut off. When running the wire it is near the hood release able and you may be able to run the wire thru there and not drill a new hole. I've done this for neon lights under cars as well as stereo systems requiring an amplifier. If you drill a new hole even though its under the hood I would put a little blue RTV silicone over the new hole to prevent moisture from getting past the fire wall or road salt.

Oct 16, 2010 | 1997 GMC Sierra K2500

2 Answers

Lights on a fisher xtreme plow wont work


I'm guessing that you have already checked to make sure there is power going to the plow lights. If not use a test light and make sure. The most likely problem is the grounds from the plow lights themselves to the frame. Take the lights apart and check and/or replace the grounds, wires inside the case take a lot of vibration and that can cause them to fail.Don't forget to check the bulbs to be sure they're good too. Hope this helps.

Dec 17, 2009 | 2007 GMC Sierra 2500HD

1 Answer

IS THERE A HEADLIGHT RELAY FOR HIGH/LOW BEAMS, OR IS THAT THROUGH THE MULTIFUNCTION SWITCH IN THE TURN SIGNALS ON THE STEERING COL. HAVE AN ALTERNATING PROBLEM. I HAVE HIGH BEAM ON FRNT. RIGHT,NO LOW BEAM...


Headlights in my '03 Jeep Cherokee are through a relay, both both light's are on the same relay I believe.

I would be suspect of any added modules which drive the headlights. Hopefully, they didn't "splice" in, but used one with factory connectors, so you can remove the module and reconnect the connectors as the vehicle was shipped from the factory.

When it's all said and done, you really need a wiring diagram for the vehicle. I can get one for my Jeep at the local repository library. Don't know about your truck. You may be able to find a diagram through some hard searching on the www.

Let me know if you need someone to bounce thoughts off of.

Dec 10, 2009 | 2004 Dodge Ram 2500

1 Answer

I have a unimount plow. My headlights on the plow will not come on with headlight switch


hi 1st check if light working 2u can not run all lights at same time; ok u need a rely4 pin or 5pin rely 85 86 pins to energize the rely pins 30 87 is used to energize the lights 87a is not used center pin; 3need tagl switch that have light ;find right wire for parking lights hookup 85to that wire 86 go to Negev 87 go to a15 amp fuse that gets power from B+ .30 go to plw lit now u can run low beam+plw or H beam+plw now u can run safly evriting

Dec 08, 2009 | 2000 Chevrolet 2500

1 Answer

I need a wiring diagram for 1987 Chevrolet 3/4 ton


The Haynes repair manuals usuall have wiring diagrams in the back of book.Around $20.

Oct 16, 2009 | 1990 Chevrolet Crew Cab

1 Answer

What started this mess? tailights, fog lights, brake lights....


The relay has nothing to do with the tail lights, but replacing the switch sounds like a good idea. There's a nut holding it in place, see http://www.skandix.de/en/spare-parts/electrics/switches/switch-headlight/1027524/ to get an idea of the construction. And the price. This is not worth fiddling about unreliable workarounds...
In addition, if fuses 15 and/or 16 burn frequently there might be a problem with the tail light cabling.

Good luck
Ingo

Feb 28, 2017 | 1987 Volvo 240

1 Answer

My headlights wont power on. i have power to the h4 connectors and all my other accessory lights are working except my headlights. what is the problem or how can it be fixed?


My friends did the same thing, apparently there is a bimetlalic strip
in the headlight switch, the temperature must be up for the headlights to work. I do not know the rational behind this.
So need a new headlight switch (his is on the signal light arm), of
find a way to bypass the temperature sensor (bimetallic strip)

Aug 05, 2008 | Datsun 510 Cars & Trucks

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