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Truck is a M1009. All wiring is stock. Both alternators are stock.

I traced them as you said and have 10.6 volts for gen 1 at the plug, and nothing at gen 2... Looks like a good cleaning may solve gen 1 light not working, but not sure what to do about gen 2. 24 volt fuse checks good. This is odd, because with my instrument panel still off and engine running...

Thanks for the help! All wires are pugged into both alts, and it all looks stock. I see no jumpers to the battery. I checked the bulbs by pulling the instrument panel, taking out the bulbs, and using meter to check for resistance. Also I took the 6 legged ground off, roughed up both sides...

Okay, I have searched and searched. All I have found are instances where one or the other light was not working, or both out and a no charge issue. On my m1009 both gen 1 and 2 lights never come on when key is turned, and once running I have 29 volts so that tells me both alts are working. I...

How do I put a dimmer switch in?

None of the fuses are blown. What else could it be?

i'll try that

It's not the brake light switch. Could it be a fuse?

The brake lights don't work. I'm new to this so I have no idea what to do. All of the other lights work. Any help would be appreciated.