[QUOTE]Originally posted by rleeds
The never ending discussion about my'85 F150 continues...
I installed a 351w into my 4x4 F150, replacing the I6/300.

The donor engine had the wires cut at the alternator. The colors don't match what came with the truck harness. I did some educated guessing and now I'm having problems.

The new alternator is a 60a.
When I start the truck, the starter does not disengage.

First Off :
The starting circuit and charging circuit are two different systems and are not related except for sharing a power connector at the starter solenoid.


You also didn't say if it was a side or rear terminal alternator




The stator connection is disconnected/cut.
Small wire supplies a small amount of power to the electric choke


I believe I have the fatter threaded connector connected correctly.

to the Big red terminal


The smaller threaded connection is a plug on.

That would be the Field wire that goes to the Voltage reg


If I turn the ignition key on and disconnect the little red wire from the starter solenoid I can jump the solenoid and start it.

That little red/another color is for the starter to engage with the key


However, it is not charging.

The battery gets its re-charge from the Big Wire that goes to the Red connector on alternator and attaches to the big lug on the starter solenoid

Here is a diagram for you to view.

I'll be back with another alt virew shortly.






Okay I'm back,
Here is a photo of the Rear Terminal alternator.
Is this what it looks like ?