I had been trying to figure out this lighting issue I had since I bought the car, finally threw in my hat and took it to a shop. Got back bad news. They are recommending that I replace the whole Fuse Box as the Low beam check relay is bad. Has anyone replaced a fuse box in a car? I found one used on classic daily but im not sure if I should chance it with a used fuse box or just let the shop do the install and fix. Below is the write up from that part of the diagnosis:
- Verify Client Concern: Verify - This appears to be true, but the low beam bulbs on this car are duel filament. One filament is for
low beams, and a 2nd is used in conjunction with the inner bulbs for the high beams. When the high beam switch is activated, only
the proper high-beam filament is being energized. So the low beam circuit is non-functional.
- Check fuses 14 & 15, which are for left and right low beams - fuses are good
- Check for voltage at fuses with key on and headlights turned on - no voltage
- According to wiring diagram, fuses 14 and 15 get voltage from low-beam relay THROUGH the low-beam "check relay", which is
integrated into fuse box circuit board.
- Checked for source voltage at pin 30 of low beam relay - 12v.
- Applied jumper wire to bypass low beam relay (if lights come on, then relay is bad, or something pre-relay, like the switch) -
lights did not come one.
- Verified that 12v was reaching pin 87 - yes.
- Applied voltage to fuses 14 & 15 and low beams come on - This verifies that the wires from the fuse box to the lights is good.
- With relay jumped, checked voltage at fuse 14 and 15 - still no voltage - The only thing between low-beam relay and fuses 14
and 15 is "low beam check relay", which is integrated into fuse box.
* Diagnostic Results: Low beam check relay is bad, requiring replacement of fuse box
- Verify Client Concern: Verify - This appears to be true, but the low beam bulbs on this car are duel filament. One filament is for
low beams, and a 2nd is used in conjunction with the inner bulbs for the high beams. When the high beam switch is activated, only
the proper high-beam filament is being energized. So the low beam circuit is non-functional.
- Check fuses 14 & 15, which are for left and right low beams - fuses are good
- Check for voltage at fuses with key on and headlights turned on - no voltage
- According to wiring diagram, fuses 14 and 15 get voltage from low-beam relay THROUGH the low-beam "check relay", which is
integrated into fuse box circuit board.
- Checked for source voltage at pin 30 of low beam relay - 12v.
- Applied jumper wire to bypass low beam relay (if lights come on, then relay is bad, or something pre-relay, like the switch) -
lights did not come one.
- Verified that 12v was reaching pin 87 - yes.
- Applied voltage to fuses 14 & 15 and low beams come on - This verifies that the wires from the fuse box to the lights is good.
- With relay jumped, checked voltage at fuse 14 and 15 - still no voltage - The only thing between low-beam relay and fuses 14
and 15 is "low beam check relay", which is integrated into fuse box.
* Diagnostic Results: Low beam check relay is bad, requiring replacement of fuse box
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