2001 Cummins 4BT, which is the field/exciter wire?

[RenoHuskerDu]

This is the alternator on a 2001 Cummins 4BT (CPL 2857, engine family CEXL0239ABA) in a Mauldin MX13XT-01 loader/grader/ripper.

Anybody know which is the field/exciter? I need to jumper it due to rodent wire damage under the cab of the machine.

 

[TractorTech]

What make/model alternator?

 

[RenoHuskerDu]

What make/model alternator?

It's a Bosch, and here are the only numbers on the back. But its front label was paper and is illegible.