Relay problems............? - Mercedes-Benz Forum
 
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post #1 of 7 (permalink) Old 03-14-2015, 08:12 AM Thread Starter
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Relay problems............?

Hey everyone, I Have a 1999 G500 LWB and a few weeks ago I noticed that the head lights started to get progressively dimmer and dimmer and the "HIGH BEAM" indicator on the dash became brighter and brighter. One evening, when I switched the headlights on, they wouldn't come on at all. The fog lights work perfectly as does all the other electronics, I'm guessing it's just a bad relay, but I haven't the slightest clue where it is, can anyone please help?
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post #2 of 7 (permalink) Old 03-14-2015, 09:03 AM
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That particular set of symptoms is a bit weird. The usual pre-MBUSA high beam problem is that they become intermittent. The cure for that problem is posted here: clubgwagen/forum/viewtopic.php?f=25&t=5855

I'm guessing that the problem you have is different. Perhaps the wire from the switch to the actual bulbs has become damaged somewhere along the way. Are the low beams dim too? If so, then the likely culprit is the grounding for the headlights.
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post #3 of 7 (permalink) Old 03-14-2015, 10:51 AM
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If the headlamps no longer come on, but the high beam indicator light does when the headlamps are set for low beam, then I would look into a bad ground in one or both of the headlamps. In particular, look for corrosion in the wiring or the actual headlamp socket. As the headlamp ground connection resistance becomes higher (due to the corrosion), more and more of the lamp running current tries to return to ground via the high beam filament and circuit (the high and low beam filaments for a resistive voltage divider). The only pathway for that current flow is through the high beam indicator bulb which will cause it to light. An easy test for this is disconnect both headlamps and see if the high beam indicator lamp functions normally.
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post #4 of 7 (permalink) Old 03-14-2015, 10:54 AM Thread Starter
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Thanks @AlanMcR for the quick reply, That link really helped, much appreciated!!!
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post #5 of 7 (permalink) Old 03-14-2015, 12:41 PM Thread Starter
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@Floobydust That's it!!!!!!!!!!!!! I did exactly what you said, and disconnected both headlights and the high beam indicator stayed off, THANKS!!!!! I also noticed the ground leads were burnt to a crisp.....
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post #6 of 7 (permalink) Old 03-15-2015, 06:39 AM
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I'm glad your G is back on the road to a well lighted future. Some food for thought - crispy ground wires often result from running high wattage bulbs. So does damage to the switch as referenced in AlanMcR's post. If you want to run high wattage bulbs, I would strongly suggest using a relay setup where the actual lamp power comes directly from the battery.
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post #7 of 7 (permalink) Old 03-15-2015, 12:14 PM Thread Starter
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Thanks @Floobydust and @AlanMcR , extremely helpful information. Everything works as it should now because of you guys, thank you!!!!!!
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