Voltage regulator upgrade? Keep frying voltage regulators with swap

Checked and found continuity between the negative field and a chassis found. Seems that's the root of my problem at the moment. I'll have to take a look at the alternator and see if that field is rubbing against something behind the alternator and allowing it to ground.

Also, I looked into the different voltage regulators. Here's what I found:

Mopar voltage regulator options:
C8313 "adjustable voltage for up to 7 amp alternators." and "40 to 100 amp plus alternators"
http://www.monstermarketplace.com/a...eavy-duty-external-chrysler-voltage-regulator

C8313 - heavy duty up to 10 amp field draw
"ERCKE Economy External Regulator kit. Includes a good quality standard duty voltage regulator and wiring harness. Note: economy Regulator has a field load capacity of 5 amps. The upgrade heavy duty adjustable regulator has a 10 amp field duty rating"
http://alternatorparts.com/external-voltage-regulator-high-output-alternator-kit.html

C603Z AC Delco
"for 60-114 amp alternators"
Rock auto says:
ACDELCO Part #*C603Z****{#12336870}
REGULATOR,VOLTAGE W/EXTERNAL REGULATOR
REGULATOR,VOLTAGE 2 WHEEL DRIVE; 100, 114 AMP W/EXTERNAL REGULATOR
REGULATOR,VOLTAGE 2 WHEEL DRIVE; W/EXTERNAL REGULATOR EXC. 100, 114 AMP
REGULATOR,INTEGRATED CIRC VOLTAGE 2 WHEEL DRIVE; EXT REG


Standard VR125
40-120 amp*
Notes:*{SELECT, Borg-Warner Brand "P" Version {R296P} Also Available; w/Chrysler Alt; w/40, 50, 90, 120 Amp};Volt. Reg; Years:1989-1989; Per Car Qty:1
Vehicle:*1989 PLYMOUTH HORIZON L4-135ci 2.2L F/I Vin D

Various voltage regulator options:
http://www.cpgenerator.com/voltageregulators.html