Tail Lights - having issues

[Starter986]

Originally Posted by particlewave

Replace fuses A4 and A7 (for a layperson, visual inspection of a fuse tells you nothing about its condition).

If the issue persists, remove the headlight switch and clean the inner contacts (not the connector pins on the back) by spraying electrical contact cleaner into the switch and working the switch knob back and forth.

Should I understand that even if the/a fuse looks good... no burnt connecter... that it could be bad? If an electrical problem persists (similar to the OP), and the/a fuse looks good... replace it anyhow?

Any other signs to look for if the/a fuse "looks" good?

Thanks!

[particlewave]

Originally Posted by Starter986

Should I understand that even if the/a fuse looks good... no burnt connecter... that it could be bad? If an electrical problem persists (similar to the OP), and the/a fuse looks good... replace it anyhow?

Any other signs to look for if the/a fuse "looks" good?

Thanks!

Absolutely. A fuse can be bad, but look completely normal. You can test it with an ohmmeter (anything over 1ohm is bad, good should measure under 0.5ohms), but they’re cheap and it’s easier to just swap it out. If swapping doesn’t solve your issue, the fuse was likely fine.

[piper6909]

Originally Posted by Starter986

Should I understand that even if the/a fuse looks good... no burnt connecter... that it could be bad? If an electrical problem persists (similar to the OP), and the/a fuse looks good... replace it anyhow?

Any other signs to look for if the/a fuse "looks" good?

Thanks!

You can also check without having to remove the fuses. Use a volt meter or a light probe with one end grounded. You can probe the fuses at the butt end. The butt (plastic) end of the fuses have tiny openings where you can probe each of the blades.




If you have power on both sides, the fuse is good!