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  #1  
Old 07-22-2017, 05:16 PM
Mighty190's Avatar
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w202 intermittent healight issue

1995 C36 with 160,000 miles. My headlights work about 70% of the time. When they fail the parking lights do still work but holding the high beam lever back does not work. So I'm guessing its a relay and not the switch.

Where is the relay located and is this a common issue?

Its been hard to test because they always seem to go out at the worst time when I can't deal with it and then work when I have time to look at it.
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  #2  
Old 07-23-2017, 12:36 AM
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There's no relay. Do both sides fail at the same time? When the lights fail, if you pull the knob out will the fog lights go on?
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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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  #3  
Old 07-23-2017, 07:33 PM
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Yes both sides will cut out at the same time. The parking and fog lights still work. I mean there has to be a relay somewhere. The switch doesn't have full power running through it.
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Current:
'74 450SLC
'89 190E
'95 E420

Previous:
'94 E320
'87 300E
'73 350SL
'75 450SL
'95 C36
'99 C43 55 swap
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  #4  
Old 07-23-2017, 08:57 PM
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Here's the diagram. Good luck finding the relay. I don't see one. I would say it is the light switch, labeled 40 on this diagram, but in that case, when you pull the dimmer lever toward you the brights should still go on, although they would not when you pushed it forward.
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w202 intermittent healight issue-img_4752.jpg  
__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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  #5  
Old 07-28-2017, 09:38 AM
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It was the switch. Swapped it out with a junkyard part and it seems to be good. It must have some weird contacts in there.
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Follow the team at:
http://www.forthesakeof.racing/
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Current:
'74 450SLC
'89 190E
'95 E420

Previous:
'94 E320
'87 300E
'73 350SL
'75 450SL
'95 C36
'99 C43 55 swap
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