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G50911's Avatar
 
Join Date: Nov 2013
Location: sf bay area
Posts: 956
help with headlight troubleshooting

i started to work on my lights tonight and i have everything hooked up except the driver headlight. it's weird cause the existing wiring seems to be new and i'm getting power to the harness. but when i turn on the lights i get nothing on that side. passenger works fine.

anyone got any ideas what/where to check next? these are upgraded H4's from the stock sugar scoops. do i need a relay? i swapped bulbs so i know it isn't that. baffling cause i can get power to the plug but doesn't turn on.

here are some pics of how it's wired...




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1967 911 (Azzuro Thetys) - #308439
1971 911 (PTS Black) - Built 3.6 Sleeper
1989 911 (Grand Prix White) - Cabriolet Bone Stock
Old 03-10-2014, 08:26 PM
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Make sure that brown wire is grounded good.
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Pete
79 911SC RoW
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Old 03-10-2014, 09:08 PM
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thanks pete. can i assume those leads go back to the fuse box? from the first pic, do the wires seem in the right plug slots?
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1967 911 (Azzuro Thetys) - #308439
1971 911 (PTS Black) - Built 3.6 Sleeper
1989 911 (Grand Prix White) - Cabriolet Bone Stock
Old 03-10-2014, 09:15 PM
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ROW '78 911 Targa
 
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Join Date: Jul 2011
Location: Salem, OR
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Brown is ground on our cars. Use a meter and see if it is connected to the battery negative cable.

Personally, I would cut off the butt splices and use solder and adhesive lined heat shrink for those connections as they tend to get warm, then cool off repeatedly and will corrode inside over time.

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Dennis
Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C
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Old 03-10-2014, 09:51 PM
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