He removed the alternator to do all of this work, yes?
Sounds like he didn't get the multi-pin connector plugged back in, or not quite...
Possibly damaged those wires... but more likely it didn't get plugged in well...

There aren't that many connections to make. That one, and the large wire to the battery that connects to the post on back... unless they made MAJOR changes to the design... that should be it.

Done that exact same thing myself... then hit my head on the hood latch.
Painful, but justified...

 

The alternator was never removed to do this work.
After he performed the work I mentioned a code came up that read P1638 which is the Generator F-Terminal Circuit. We are wondering what this could be especially when the alternator was never touched during this whole process.

 

Then it sounds as if either...
1) the wiring to the alternator has been damaged (it still could have been loosened by the other work), or
2) the internal regulator has failed for whatever reason.

But just to be sure,
check ALL the fuses to ensure NOTHING is 'bad'. More than likely tho,
it is 1) or 2)...

Alternators are pretty straightforward devices these days... very self-contained.

Hope this helps!

 

what is the Generator F-Terminal Circuit? ive tested the battery and it good and the alt is good to. ive checked all the connection and wires and all are good as well. even the fuses are good. but still getting battery not charging & service charging system on the dash with the p1638 code... im confused on what to look for now. any ideas?
thnaks

 

having the same problem on a 87 seville 4.1b all of the sudden not charging . replaced with used altenator same issue , weird

 

Old thread, but - The F terminal (Field) receives system (battery, at start) voltage to excite the windings and voltage regulator. No F voltage, no charge. The L terminal (Light, for the old idiot light) now sets the warning message - same idea - no alternator excitation, no charge indication.