84-85 Trucks & 4Runners 2nd gen pickups and 1st gen 4Runners with solid front axles

Swapping 40 amp LEF alternator to 55 amp FEN

Old Feb 17, 2024 | 04:30 PM
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Swapping 40 amp LEF alternator to 55 amp FEN

My 84 originally had a 40 amp LEF alternator and a 5 pin external regulator installed. The alternator is no longer working after having it tested.

I happen to have a new 55 amp FEN alternator along with a 6 pin external regulator.

I can't seem to find any wiring diagrams showing a 55 amp alternator in regards to wiring the 6 pin regulator

Is this swap possible without having to redo all the charging system wiring? Thanks.
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Old Feb 19, 2024 | 04:25 PM
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I found a Pinout

It turns out in the Haynes manual there is a photo of a pinout for the six pin voltage regulator,

​​​​​​The last pin I have not figured out to use is the one labeled as L in the photo, any leads as to where this goes?

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