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  #1  
Old 04-06-2010, 04:47 PM
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Join Date: Apr 2008
Location: Richmond VA
Posts: 202
No headlights!

Hope someone can guide me in the right direction.

I had my 86 420SEL A/C recharged yesterday at my local indy shop, and they said they couldn't control the compressor from the dash controls, but were able to get the compressor to run, and cold air was blowing, by connecting 12V to the compressor terminals. I guess they used a battery and jumper leads of some kind.

Anyway, ever since they did that, I have no headlights. The (2) fuses look to be fine; is there a separate relay or something that might have blown?

I am not sure the work on the compressor is related...

What should I look for first?

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Simon Shearer

1986 420SEL

2000 Porsche 911 Millenium Edition Carrera 4
2010 Lexus RX 350
2002 Kia Rio
2002 Hyundai Accent

Last edited by simonshearer; 04-10-2010 at 10:46 AM.
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  #2  
Old 04-06-2010, 05:07 PM
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Power comes from headlight switch, to combination (dip) switch, to fuses, to lamp module.

Do you get 12V to any of the headlight fuses, high OR low beam??
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  #3  
Old 04-06-2010, 05:12 PM
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Quote:
Originally Posted by M.B.DOC View Post
Power comes from headlight switch, to combination (dip) switch, to fuses, to lamp module.

Do you get 12V to any of the headlight fuses, high OR low beam??

I will get the multimeter out tonight when I get home. Thanks.
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Simon Shearer

1986 420SEL

2000 Porsche 911 Millenium Edition Carrera 4
2010 Lexus RX 350
2002 Kia Rio
2002 Hyundai Accent
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  #4  
Old 04-06-2010, 10:12 PM
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Join Date: Apr 2008
Location: Richmond VA
Posts: 202
No driving or tail lights

Can't detect voltage at the fuses.

Have no tail lights either although I do have brake lights thankfully.

Seems I can't drive at night until I solve this conundrum.
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Simon Shearer

1986 420SEL

2000 Porsche 911 Millenium Edition Carrera 4
2010 Lexus RX 350
2002 Kia Rio
2002 Hyundai Accent
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  #5  
Old 04-10-2010, 10:44 AM
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Join Date: Apr 2008
Location: Richmond VA
Posts: 202
...still no head or tail lights...

Quote:
Originally Posted by M.B.DOC View Post
Power comes from headlight switch, to combination (dip) switch, to fuses, to lamp module.

Do you get 12V to any of the headlight fuses, high OR low beam??
I tested voltage at the fuses and I get 12V at both L & R low beam and at both L & R high beam.

I have dash and instrument lights; brake lights (inc. 3rd), turn indicator lights, rear side lights... but still no head or tail lights on either side.

Headlamp bulbs look good; all tail light bulbs look good; the bulb-out indicator light has not come on.

I'd be very thankful if anyone can point me in the right direction; what do I need to check next?
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Simon Shearer

1986 420SEL

2000 Porsche 911 Millenium Edition Carrera 4
2010 Lexus RX 350
2002 Kia Rio
2002 Hyundai Accent
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  #6  
Old 04-10-2010, 03:30 PM
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Join Date: May 2009
Posts: 398
Headlight relay in the screwed down portion of the fuse box. Its the longest relay in there cant miss it. Go to a junkyard to get another they run over 200 new. It controls all the lights. Also known as the "bulb out indicator".
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  #7  
Old 04-10-2010, 06:25 PM
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Quote:
Originally Posted by macdrone View Post
Headlight relay in the screwed down portion of the fuse box. Its the longest relay in there cant miss it. Go to a junkyard to get another they run over 200 new. It controls all the lights. Also known as the "bulb out indicator".
Thanks!
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Simon Shearer

1986 420SEL

2000 Porsche 911 Millenium Edition Carrera 4
2010 Lexus RX 350
2002 Kia Rio
2002 Hyundai Accent
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  #8  
Old 04-11-2010, 02:13 PM
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Join Date: Apr 2008
Location: Richmond VA
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Quote:
Originally Posted by macdrone View Post
Headlight relay in the screwed down portion of the fuse box. Its the longest relay in there cant miss it. Go to a junkyard to get another they run over 200 new. It controls all the lights. Also known as the "bulb out indicator".
That did it... I have headlights again! Many thanks.
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Simon Shearer

1986 420SEL

2000 Porsche 911 Millenium Edition Carrera 4
2010 Lexus RX 350
2002 Kia Rio
2002 Hyundai Accent
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  #9  
Old 04-11-2010, 06:16 PM
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Join Date: May 2009
Posts: 398
Yep the cooling fins in the units have been changed and the newer you get the longer they will last, maybe soon they will all be electronic.

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