No power to white wire on exciter gen 1

[Cmwalton]

So after going through and checking volatages on both gen plugs and the voltage at gen1 bulb here’s what I came up with.

I have no power at white wire plug on gen 1 and I have power at white wire on gen 2 and I checked voltage at gen 1 bulb and it came to 12v but still doesn’t light up when key is turned. now my question is, where is the gen1 white wire supposed to plug in at to get power?because it’s clamped onto a pink wire under steering column I’ll attach pictures. I also just had gen 1 rebuilt a few weeks ago.

Also yes I replaced bulb and made sure socket was good and cleaned off the circuit bored where it makes contact with socket

I hope this makes sense, thanks

 

[Curtisje]

The plugs on the alternators should have red and brown wires.



We need to figure out which wire your white wire is supposed to replace. I'm guessing the brown which goes to the dash light.

 

[Cmwalton]

The plugs on the alternators should have red and brown wires.

View attachment 828448

We need to figure out which wire your white wire is supposed to replace. I'm guessing the brown which goes to the dash light.

Yes the white wire is supposed to be brown because on passenger side gen 2 it’s still a brown wire

 

[Curtisje]

 

[Cmwalton]

View attachment 828453

View attachment 828454

I looked at the diagram you posted, what’s is it going into? It’s hard to tell in that picture

 

[Curtisje]

I looked at the diagram you posted, what’s is it going into? It’s hard to tell in that picture

Download the TM from the site. Then go to pdf page 865 or so and you will see the full diagram.

 

[Curtisje]

Look for the brown wire that isn't hooked to anything in this wire loom circled in yellow. Left side of engine right behind the alternator.



That should be your wire.

 

[Cmwalton]

I did notice a cut wire but I thought it was black I’ll get a better look tomorrow thanks for help and I’ll look at pdf in meantime

 

[Keith_J]

Replacement connectors for this part (internal 27SI regulator) are often color coded red and white. I bought one to make an alternator test rig..bypassing all the dash light, relay and switch. I dislike tracing faults and really dislike removing perfectly good alternators.

 

[Cmwalton]

Look for the brown wire that isn't hooked to anything in this wire loom circled in yellow. Left side of engine right behind the alternator.

View attachment 828469

That should be your wire.

Thank you for the help!! That was the trick there was a cut brown wire and I tested it for power with key on and then connected it back together and now light comes on! But now stays on while truck is running I just had this alternator rebuilt, could I have ruined the alternator when I drove the truck when gen 1 light wasn’t working right and only get 12v at the alternator

 

[Curtisje]

I don't know... There is a post on here somewhere... maybe in the sticky... that goes through the steps of checking the alternator while it is on the truck.

 

[Cmwalton]

I don't know... There is a post on here somewhere... maybe in the sticky... that goes through the steps of checking the alternator while it is on the truck.

Thanks I pulled it and had it tested at a rebuild shop and they said regulator burned out probably due to it not being wired up right