Headlights randomly shut off for a brief moment, then back on - JeepForum.com
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post #1 of 2 Old 01-21-2020, 09:49 AM Thread Starter
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1994 XJ Cherokee 
Join Date: Nov 2019
Posts: 29
Headlights randomly shut off for a brief moment, then back on

Hey all, this problem has happened to me about two or three times. I'll be driving along and both headlights will randomly shut off and then come back on. I don't do anything specific to influence this. Is there a ground that specifically controls the headlights? My interior lights do not shut off when this happens. Thankfully, I have a light bar because this has happened at night.

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post #2 of 2 Old 01-22-2020, 06:40 AM
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1990 MJ Comanche 
Join Date: Oct 2009
Location: Prescott
Posts: 12,069
The breaker for the circuit is in the headlight switch.

This will fix the problem and give you brighter lights, all for less parts and labor than replacing the headlight switch.

Putco relaysHeadlamp harness

Itís easy to install a supplemental headlight harness.

From the factory, the voltage to the headlight bulbs travels from the battery, through connectors, inside the cabin, to the headlamp switch, and then back out to the lamps via undersized wire and more connectors. Itís not uncommon to find only 10.5 volts at the lamps.

The supplemental harness is installed so that it provides battery voltage to the lamps and is just triggered by the factory wiring. The result is about 35% brighter headlamps and headlight switches that donít melt and burn out.

Hereís a link to a harness on ebay: http://www.ebay.com/itm/CERAMIC-H4-H...-/330997592807

Absolutely plug and play:

Remove grille and headlamp bulbs. I fed my harnesses from the passenger side starting between the battery and the back of the headlamp housing, over to the driver side.
Plug the driver side bulb into the new harness.
Attach the new harnessís ground wire under one of the small bolts on the radiator support after scraping the paint off under it.
Attach the harness to the existing harness behind the grille working toward the passenger side.
Plug the new harness plug into passenger headlamp.
Plug original headlamp plug into receptacle on new harness.
Attach the ground for the passenger side just like you did the driver side under a radiator support bolt.
Attach relays with provided bracket on the passenger side inner fender.
Connect power wires to battery.
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