Damn, alternator isnt charging. How to check?

[icanfixall]

Or the positive terminals. Just cut the power to the trucks electrical system.

 

[Agnem]

If memory serves me, when your standing at the passenger fender, and your looking at the connector on the regulator, you will want the first terminal nearest to the motor, and then the 3rd one towards you. So jump from terminal 1 to 3, and that should full field it. I make up a short jumper wire by crimping a flat blade connector onto each end of the wire, and then just insert the blades into the connector when it is unplugged from the regulator.

 

[Greg5OH]

Alrigth, so i conencted the red alt terminal direct to battery, voltage only jumped up .4. yup she dead.
oreileys had a 100 amp model for 100 bucks, bougth that, bougth some fuel, installed new alternator, all on my 1 hour lunch break.
13.8 volts at idle, success!

 

[icanfixall]

Well another charging issue solved. Nice lot o work got done on that lunch break too...

 

[chris142]

Keep us updated on how long the rebuild lasts.ive had much better luck having mine rebuilt locally.much cheaper too

 

[Greg5OH]

it appears to be a new unit. hencho en mexico. motorcraft on the back.

 

[Greg5OH]

hmm, jut drove to work, voltage needle is bouncing around. between the A and almost touchgin 18v at times.
any ideas?