The headlights/tail lights are not working, but did previously. Also, the left front turn signal doesn’t either, but the left rear does as does the emergency flasher. All other lights work as expected. All lights worked fine previously.
Background:
This is a ‘37 Chevy 1/2 ton rewired by the PO to 12 volt with a new, then, wiring harness. I’ve owned the truck some 20 years. Until recently there have not been any problems with the wiring, except for the learning curve in installing a a 7 wire turn signal switch years ago. Even that has worked since then without problems. Also, installed years ago was a rear window mounted third brake light and T/S. It too works as expected.
Done so far:
Inspection of the harness does not show any indication of wear or damage.
Checked grounds—good.
Tested bulbs—good.
Checked in-line fuse—good.
Tested for power in to light switch—no power.
Tested power in to fuse—no power.
As noted above except for head/tail lights and left front T/S light all other lights, including brake, work as expected.
Test failed on wire from harness to LF T/S, but emergency flasher to that light does work.
I am thinking there might be two independent problems internal to wiring harness. Are there any other tests that should be done?
Thanks in advance for any suggestions/help.
