On the regulator it should be marked. May be with "F" or "FLD"

Mounted on the truck the top connection is "Bat" the middle is "ARM" and the bottom connection is "FLD"

Kinda hard to see the writing on the terminals.

Here is a link to one on Ebay and you can zoom in on the pictures to see which terminal is which.

http://www.ebay.com/itm/Voltage-Reg...ries&hash=item5b043a9536&vxp=mtr

Last edited by Roy Rodgers; 10/03/2014 1:07 PM.