Evan Reid

So I removed my altenator on my 84 pickup.. noticed this blue wire wasnt connected to anything, it may have gotten disconnected somewhere when I pulled the wires from the altenator itself but not sure where. Can anyone help?

L5wolvesf

Where does the other end go?

Evan Reid

Comes out with the wires that connect to the altenator.

L5wolvesf

I'll take a look at mine in the AM.

Evan Reid

thanks

RAD4Runner

Please keep us posted.
I don't see any blue wire documented on on 1984 and later, but I see one on 1983 schematic. It goes to the condenser. It's those little black blocks that screwed/mounted on body metal...

wyoming9

iTrader: (1)

I wonder if a older harness was swapped in at one time.

Since it looks like the blue wire was tapped off and not used .

Just a thought.

RAD4Runner

And on my 1986, there's also a black wire coming out of the alternator harness that is not documented but is grounded to the power steering pump mount bracket.

L5wolvesf

I looked at the Haynes wiring diagram and like RAD says - there's a black wire coming out of the alternator harness that is not documented. It is grounded to a bolt on the engine.The other end is the connector at the bottom of the attached pic.

RAD4Runner

Tns, L5wolvesf.

O.P.,
To be safe measure voltage at that blue wire with engine off, with IGN on but not started and with engine running. Anything?

Evan Reid

I'll check it out when I get home, thanks for all the info everyone.

Evan Reid

I think it may be a ground wire like you've all mentioned, I undid some of the electrical tape and got down to the bottom of the wire(see pic) blue wire connected to the black wire with yellow connector, safe to assume it's a ground? Just bolt to anywhere then?

also, tested my altenator which is why I replaced it, the voltage regulators purpose is to keep the voltage from going to high right? I didnt replace the regulator assuming it was only the altenator.

RAD4Runner

So the blue wire is not stock. You sure that black wire is on the HARNESS SIDE of alternator harness? Checked voltage on it like I suggested above?

Evan Reid

yea not getting any voltage on the wire.

RAD4Runner

OK, most likely that black wire that L5Wolves shows above.


IF it might help... On 1986 to 1988 (maybe 1989, too), there is an intermediate connector before the alt connector. It is round and near the black block (shown below). The ground wire that goes to alt or power steering pump bracket is on that connector.



IF you're not having a problem. Just insulate the end so it does not short anywhere. BUT one last step so we know. Pls measure resistance to body ground.