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Old 07-07-2015
mpierce mpierce is offline
Senior Member
Join Date: Feb 2014
Location: Scranton
Posts: 1,661

I think he may be right. A number of years ago the alternators on my CAT C-15 became available with a "sense" terminal". IF you ran a wire from here to the batteries, it would then read the voltage directly from the battery, rather than from the normal charge wire to the batteries.

It provides a better way to charge the batteries correctly, but is NOT necessary. I have run with, or without, this wire connected. It works either way.

Without the "sense" wire, it regulates just like it did before any sense wire was available. It just charges the batteries a little more correctly with the wire attached.

Otherwise, what is the option? Change to a different alternator?

Good Luck.

Melvin and Charlene Pierce
Scranton, ND
"Smoke N Mirrors" Royale Conversion
1990 PT40WB
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