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Unread 01-12-2014, 08:32 PM   #1
VTEK1
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TruckLite issue

So I had my headlights wired up with a home-brew harness with two relays and about a week ago the high beams started freaking out, and then nothing. I swapped a bunch of relays around, traced wiring...nothing fixed it.

I went back to the stock headlight connectors which I cleaned and got a little bit of corrosion out of. No the high beams come on and flicker, like a very fine flicker; almost like on the motorcycle.

Because the stock connector is what "flips" the relay to high beam I'm thinking thats the issue, so I dived into the fuses and such and nothing.....

Any ideas, it sound kind of like a high beam switch on the column but just want a few opinions and ideas. Thanks.

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Unread 01-13-2014, 01:42 PM   #2
uberxj92
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You can use a multi meter to watch for the fluctuations from the switch.
I use a home brew harness with 2 relays no issues. Maybe a ground not big enough or dirty.
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Unread 01-13-2014, 07:46 PM   #3
chris87xj
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XJ headlight switches are know to stuggle with carrying full amperage load of the lights. The purpose of the re-harnessing is to shift the load to relays fed directly from the battery thus bypassing the switch with the load. I'd pull a quick test wire from the battery positive terminal to the relay trigger to see if they come on properly. If they do, the relays aren't getting a good trigger signal from the switch. If they don't then you have homebrew harness issues. The dim lights and flickering you noted seems to indicate a bad connection.
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Unread 01-13-2014, 09:42 PM   #4
uberxj92
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As a side note I use gold plated connectors and I solder them. Its more cost but its worth it
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Unread 07-17-2014, 03:16 AM   #5
VTEK1
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After I took out the homebrew headlight harness and spruced everything up with a combination of dental tools, a wire brush, spray electrical contact cleaner, and dielectric grease.....it seems the high beams will still flicker but only when the Jeep is off. Low beams are fine. It's still a little perplexing considering I'm running a pretty large platinum battery and 4AWG cables for EVERYTHING related to the charging system. But it's all working.
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Unread 07-17-2014, 04:15 AM   #6
jay-h
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When you say high beams flicker, what is fluctuating? The voltage of coil signal to the relay or the power from the battery under load.
Is it bright/dim or on/off?


There's not much to go wrong here. If the relays are hooked up properly only a very small amount of power is needed from the light switch. You should have a very strong connection to the contacts of the relay from the battery (via fuse).
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