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Old 07-18-2020, 11:29 AM
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Food for thought: with Halogen bulbs, you might want to install a relay for the headlight circuit.
I find that high beam halogens will over-tax the circuit protection (fuse or breaker) in the aftermarket headlight switches.
I've added headlight relays to a couple of my cars to solve this. You don't have to give up the better halogen lights if you use relays.

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Old 07-19-2020, 04:51 AM
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Originally Posted by jmt455 View Post
Food for thought: with Halogen bulbs, you might want to install a relay for the headlight circuit.
I find that high beam halogens will over-tax the circuit protection (fuse or breaker) in the aftermarket headlight switches.
I've added headlight relays to a couple of my cars to solve this. You don't have to give up the better halogen lights if you use relays.
Adding relays generally solves the problem of voltage drop, too small a gauge wire feeding the headlights, i.e. reading less than 12V at the headlight.
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Old 07-21-2020, 10:23 AM
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Sealed beam halogens should not need a relay. I have them on my car for almost 5 years, no problems.
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Old 07-22-2020, 05:39 AM
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Sealed beam halogens should not need a relay. I have them on my car for almost 5 years, no problems.
It's not the light, it's generally too small gauge wire that feeds the light, allowing voltage drop. If you have 12 ga or larger you are most likely fine.
Simple test is to pull the plug from one headlight and use a 12ga or larger jumper direct from the battery (and a heavier ground) to the other light.
Or read the voltage at your headlight plug and compare it to your battery voltage.
You may be surprised at the results.
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Old 07-31-2020, 12:47 AM
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HAD a similar issue with my halogens going to high beam. with 12G stranded wire! i think it must be too much current draw myself. i switched to jeep l.e.d. headlights, more or less the universal ones. and no more problems. it was weird to because i had no problems for almost 20 years with a stock headlight switch, then one day two years ago they would just go out!!! then step on the dimmer again and the low beams would come back on. spooky
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