Uni high beam

  #1  
Old 11-29-2018, 05:36 PM
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Cool Uni high beam

Hello everybody,

Noticed my drivers side high beam was not working. Bought a new bulb and that did not fix it. Researching here a little and checked fuse #17 and pulled relay, looked ok. After reinstalling relay checked and still no driver side high beam. Indicator does come on on dash for high's. So new relay needed? Or can this one be re-soldered like I did with manual down shift button one?

Another light question: My right (passenger) turn signal works but flashes at a high rate, when either parking lights or both headlights and parking lights are on. All bulbs seem to be working. Left side works fine at all times. Could this be related to the high beam, on the drivers side, relay?

Thanks,
Mike
 
  #2  
Old 11-29-2018, 06:40 PM
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you can try jumpering the relay to see if the light comes on. the problem with the directional can be a bulb or a ground changing the resistance (messing with the capacitor's charge time) or could be the flasher relay itself.
 

Last edited by mt6127; 11-29-2018 at 06:44 PM.
  #3  
Old 12-11-2018, 01:57 PM
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OK, so flasher relay is located in the relay area under the stereo?

Just use a piece of wire to go between two prongs on the headlight relay?

Thanks,
Mike
 
  #4  
Old 12-18-2018, 08:40 PM
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relay positions vary with year and model car. you indicated neither.
 
  #5  
Old 12-19-2018, 10:23 AM
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It is a 1991 740T. The headlight relay is behind the ash tray. I pulled it and put it back and checked the fuses while there.
 
  #6  
Old 12-19-2018, 11:31 AM
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hmm, looking at the 1991 headlight wiring diagram, there IS no high/low relay. there is a headlight power relay which comes on with the ignition, and provides power to all high AND low beams, then it goes to the high/low clicker switch on the steering column, and the high beam signal goes from there to the relay panel where it splits and goes to fuse 17 and 18. fuse 17 powers the dashboard blue 'highbeam' light, *and* the left highbeam, fuse 18 powers the right high beam. Do you get both high beams if you hold the switch back like to flash the beams ?

so if there's a problem with only one highbeam, and its not the fuse, then its almost certainly the wiring at the headlight socket. the left high beam is a blue-white wire, while the right one is a red-white.... on each side, the high and low beam share the same ground connection, so if the low beam works, the ground is good. The only other significant difference is the route the wires take... the left high and low beams go through the lefthand bulkhead connector, and the right beams go through the right bulkhead connector... these are large rectangular connectors on the extreme sides of the firewall that have about 100 wires each. I had a older car where rodents had chewed through similar wiring.
 

Last edited by pierce; 12-19-2018 at 11:40 AM.
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