alternator or electrical problem????

[pontiacgp]

Since you know the alternator is good then I'd be looking at the diagram and going through the wires till I found the problem.

 

[Pontiac455]

There is a bad connection in the brown wire, first thing i would do is check the plug. Thats usually the problem. The wire is so small and sometimes ppl pull on the wire during a alt, change pulling the wire out of the connecter without breaking the insulation. Check your voltage before the plug, follow it until u get system voltage. Another thing I have seen was it being bad in the bulkhead under the wiper motor. Yer thinking its harder than it actually is, its a simple fix dude. Lemmie know what ya come up with and I will help ya out.

 

[prico1976]

thank you i will check. ill let you know

 

[prico1976]

No luck I installed a new alternator connector (plug) and still having the same problem. No charge 🙁

 

[pontiacgp]

I agee with Pontiac 455. I would put a resister in the brown wire and hook that up to a known good source of switched power. I don't think the alternator is getting excited

 

[wrenchbend1]

The main fat battery lead should have power ALL the time! you said you tested the two little wires Did you test the main fat battery lead at the alternator ? the alternator fat battery lead comes from a fusible link at the starter . All three wires should be hot when running . please let us know ! 2 Cutlasses ? You da man !!!!

thank you for all your help guys. i know for sure is not the alternator. i pulled out the alternator and put it in my other cutlass to test it and is charging fine. i must have a wiring problem. with the engine running from the two wire connectors i get 12v on the red wire and on the brown wire i get 2.7 volts. when i do the same test on my other car with the engine running i get 12v on both wires. so what can be my problem this is so frustrating.

 

[prico1976]

All those three wires have 12v plus. I even replaced the two fusible link going to the starter