Jeep CJ MPFI upgrade and upgraded alternator -
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Unread 11-20-2013, 01:53 PM   #1
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1981 CJ8 
Join Date: Feb 2004
Posts: 42
Jeep CJ MPFI upgrade and upgraded alternator

I upgraded my jeep CJ to fuel injection with parts from a '94 grand cherokee. I initially modified the brackets for the '94 alternator (jeep calls it a generator). Because I used the new alternator, I didn't need the diode that most people need to prevent electrical leakage (and won't let your engine shut off!!).

However, I really don't like this alternator. It seems to monkey with other electrical components in the jeep. I've given up trying to figure out why, and I've decided to install a CS130 style alternator.

Here's my predicament. I'm reading that I need to install a 35 ohm to 500 ohm resistor in the "L" line to simulate a dashboard light. I'm also reading that I need to install in the same line a diode that I got from Hesco in order to prevent backward electrical leakage. The diode shows a resistance of about 1 Mega ohm when I check it with the multi-meter. Is the diode by itself good enough? Do I still need the diode with the new style CS130 alternator?

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Unread 03-29-2014, 11:54 AM   #2
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1979 CJ7 
Join Date: Dec 2010
Location: Aurora, Colorado
Posts: 61
Did you figure this out? I am in the same situation replaced si to cs and have a pigtail adapter for the alt. with a 150 ohm resistor.
'79 CJ7, 258 Hesco MPFI, Grounded, Dual Batts, T-18, Scout Dana 300, D30 Frt 3.54 Yukon, AMC 20 Rear-Yukon 1pc-ARB Locker 3.54, On Board Air, , Rusty's 4'' Lift, 33" BFG KM2s,
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