Product Description
Need a 1-Wire Alternator for your 1989-2002 Dodge Ram pickup with the 5.9 Diesel Cummins? This unit has a maximum output of 160+Amps and will produce between 80A to 90A at idle depending on whether the engine is gas or diesel and shaft speeds. This unit will increase the charging capacity at all RPM Ranges with NO modifications. If you are putting the 5.9 Diesel powerplant into a vehicle not wired or equipped for it, this is your answer - no external regulator, no wiring. Just the main power feed wire. This unit has our lifetime warranty
Applications: 1989-2002 Dodge Ram with a 5.9L Cummins and anything with a 5.9 Cummins transplant
Customer Installation Video HERE 2025
Customer Installation Video HERE
We offer an optional W-Terminal or TACH pickup wire to this alternator. This option is only available on these “SE” Denso / dodge alternators that eliminate the PCM. When you select this option, we will provide a tach lead for connection to a diesel specific aftermarket tach. This is only available at the time of assembly and older units are not physically eligible for retrofit. The connection is simple, the wire is provided by us but does not need to be used if no tach is intended. This will not work with factory equipped tachometers or ignition-based tachometers, only a stator signal tachometer. The rotor has 12 poles, some calibration instructions ask this (tach shown is not included)
Tach image shown for illustration only, we do not sell tach or any gauges.
Some brands our customers have said work well:
Dakota Digital
Speedhut ; special order
ISSPRO R8586M
GlowShift
WARNING: California PROP65 Cancer and Reproductive Harm Notice www.P65Warnings.ca.gov
Product Videos
Custom Field
Product Reviews
61 Reviews Hide Reviews Show Reviews
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Best Alternator for old Trucks
Works perfectly as described. If you need a good alternator for a truck that has charging wiring system problems or simply want one that is simple and reliable, then this is the one for the job!
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136A 5.9 alternator
Best money ever spent had a lot of problems with other this one is worth every penny , couldn’t ask for a better product
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Alternator
Works great. Definitely worth the money
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One wire alternator
I installed this one wire alternator on my 1st gen Cummins and it solved my charging issues.
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Great
Perfect wish i would of done this ages ago
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Super easy install, no more messing with external voltage regulators. If your doing a cummins swap this is the solution for all your alternator woes!
Super easy install, strong voltage, great product. Out of five stars this gets six!
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joelwoolman1@gmail.com
This alternator is a apsolut must for any cummins swap project work great steady 14 volts running two 1100cca commercial batteries well down pa performance
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Bulletproof Charging
Forget about tracking down bad temp sensors or bypassing the PCM with hit-or-miss external regulators. With it's super simple installation and rock solid 14.7 charging volts, this alternator will make your 12 valve Cummins one step closer to "Wasteland Ready"!
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Best Upgrade!
Best upgrade for my 1992 1st gen cummins. very easy install and very much needed.
