Hi.

I'm trying to track down an alternator issue.

I read that if I ground the white blue wire on my 4 pin plug, my battery light should illuminate.

I cannot get my battery light to come on. With the key to ignition, it doesn't come on. I can't figure this out. What's my next step?

 

Do you get power to the black and yellow wire with the key on? If not, the fuse is probably blown. Otherwise it would be that the bulb is burnt out or missing.

 

I do get power to the black/Yellow wire. Fuses are good. Bulb is good.

I'm thinking the white blue wire has a short but I'm unsure where the wire runs to. Should I have continuity from white blue on the alt plug, all the way to the cluster white blue wire?

 

I forgot to add, I get about 5v on the black yellow wire

 

That's no good, you need to have full 12 volts there. It is very likely the fuse is blown, or there is a problem with the harness such as the fuse 15 problem of 1996-2000 models.

The white-blue wire simply goes to the cluster and thus to the bulb. The other side of the bulb is powered from the same circuit that powers the black-yellow wire.

 

Okay so I started tracing the black yellow wire in my engine harness.

The car in question is a 1990 civic dx.

I am trying to find a pinout at the moment. The black yellow wire terminates at the shock tower connector. It has continuity with the thick yellow wire.

The issue is with my engine harness