Head light ??

S

Standing Elk

Senior Member
Ok so I think I may have it figgured out but wanted to ask before ordering new parts. My head lights are pretty dim. ALL connections are clean and tight. However my coupe does still have the origional wiring harness. I had trouble with the horn not wanting to work corretly and solved that issue with a relay, So what do ya think, do I need to replace the wiring harness? Thanks
 
There's also the "other wire", the ground path.
On my car new lock washers fixed the ground path, they were rusty.
With the lens off take a wire from good ground and touch to bulb base,
Even touching the focus adjusting screw ( is that rusty??)
 
Dim lights are an indication of resistance somewhere in the path of wires from the battery to the lights.

Besides the ground, there is a distinct path of wires and connections to follow and look for bad connections, bad solder joints and corrosion.

  • Start with the battery connection. Make sure it is clean and tight.
  • From there, the cable goes to the starter post. If you have a fuse mounted at the starter, that is in series with the solid yellow wire going to the junction box at the firewall.
  • From there, a second solid wire to the ammeter, and from the other side of the ammeter, a yellow/black wire back to the other side of the junction box.
  • From there, the yellow/black goes to the generator cut-out or the terminal on the alternator (depending on which you have).
  • A solid yellow wire then goes to the light switch.

Examine the wires and connections at each end of each wire all along this path for bad connections. Some lower quality repop wiring harnesses were only crimped and not soldered.

Also, if the wiring to the lights has ever been cut and spliced, look carefully at any and all splice jobs.
 
put a voltmeter right on the wiring at the back of the light. What is the voltage there vs the voltage at the battery. Shouldn't be much difference. If there is, keep checking at points closer and closer to the power source, you'll find if there is a drop you have a bad connection. As stated above, also check all the grounds. If the original wire insulation is good, no reason to replace the wiring. People love to throw parts at their poor old A, most times it causes more problems than it solves.
 
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