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Join Date: May 2005
Location: Melbourne, Australia
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Low voltage at headlights
Hi everyone,
The problem is the low beams look like parker lights, and the high beams look like low beams. The voltage at the fuse, and at the headlight is only 3 volts when on low beam. I didn't have a helper so couldn't check the voltage when hi beams are on. battery is fully charged Is this a relay problem? Thanks for you help, Adam
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08-15-2006, 02:38 AM
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Location: Galivants Ferry, SC
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Porsches.... unfortunately....don't have relays in this circuit as delivered from the factory. You are well advised to add them. There are plenty of posts on this subject...think "Marcus Sucro"...
I would first check overall system voltage...as measured between the battery terminals. Should be 12.6 volts for a fully-charged battery. Anything close to 12.0 Volts or less is essentially a dead battery. Do this first before you start checking branch circuits. - Wil
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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08-15-2006, 04:25 AM
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yes..i already checked that. And it was 12.7v
And by the way, it is a ROW car with H4 headlights standard. Does it still not have a relay?
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08-15-2006, 04:32 AM
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No !!...Porsche is incredibly stupid in this area....
Wil
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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08-15-2006, 05:23 AM
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You're likely getting a lot of contact resistance along the "way"...and the "path" may lead to badly pitted steering column switch, which carries ALL the electrical load. A relay would reduce this hundreds-fold as it would only be a "triggering" circuit instead....
- Wil
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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08-15-2006, 05:25 AM
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You can also use the Porsche standard round relays for headlights for a more stock look. (Rather than adding the non - standard sucro relays.) Wiring up the relays into the headlight harnesses at the fuse panel is how I did mine.
Doug
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08-15-2006, 07:02 AM
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Location: TX USA
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Adam,
Sounds like a burnt stalk switch problem. Does the control stalk not switch the headlamps to the high beams when moved forward? It sounds like the 'Flash' position still works.
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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08-15-2006, 07:58 AM
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Quote:
Last edited by ruf-porsche; 08-15-2006 at 03:22 PM.. |
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08-15-2006, 03:15 PM
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Quote:
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08-15-2006, 05:56 PM
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Dirty contact or pitted contact on the stalk switch, replace the stalk switch and install relay for the headlights
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08-15-2006, 06:13 PM
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ok i will look into it.
Thanks for everybody's replies!
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08-15-2006, 07:36 PM
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