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-   -   H4 low beam issue (http://forums.pelicanparts.com/porsche-911-technical-forum/1154937-h4-low-beam-issue.html)

911S Targa 01-27-2024 05:23 PM

H4 low beam issue
 
Been a while……..

I did the full Bosch Euro H4 upgrade years ago. Did the proper upgraded install with new wires, with in line fuses, 4 relays, etc…

Having an issue with my low beam driver side H4. It stopped working a month ago, so I bought replacement 55w\100w bulbs, thinking since it’s been over 10 years of me doing the H4 upgrade on my 76 911S, low beam part burnt out, since my high beams still work.

Replaced the bulbs today, but still have the same issue. I checked the fuse panel, the inline fuse on the upgraded wire, checked the connection to the fuse panel, and the headlight. All looks good. As does the area I have them grounded to.

Could the relay have crapped out ? I’m not sure where else to look for the issue.

Thanks
Bill

timmy2 01-27-2024 05:46 PM

Yes, check the relay coils haven’t burnt up, or the contacts have failed.

911S Targa 01-27-2024 05:57 PM

Not being an expert on that, how would I go on checking that ?

pete3799 01-28-2024 04:17 AM

See if you have power and ground on the control side of the relay with headlight switch on.
Then check for power on the load side.

911obgyn 01-28-2024 08:32 AM

Test light is the easiest way to check for power, meters measure voltage and continuity.

911S Targa 01-28-2024 08:55 AM

Thank you for the info.


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