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 Post subject: 1g and 2g alternator
PostPosted: Tue Aug 07, 2018 3:17 pm 
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CSM Junkie

Joined: Mon Dec 10, 2007 9:00 am
Posts: 448
Location: Indianapolis
anyone know the difference between these two? Someone told me that the 1G and the GVR4 are the same, but don't about the 2G? anyone has seen or tried using the 2G alternator on our cars. Thanks


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 Post subject: Re: 1g and 2g alternator
PostPosted: Tue Aug 28, 2018 9:38 pm 
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Spends Too Much Time Under The Hood
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Joined: Tue Aug 23, 2011 4:20 am
Posts: 316
Location: Turlock, California
2g alternators can be wired to work in a 1g, but you have to look at the pinouts of both the early alternators and the 2g ones because the 2g wire connectors have 4 wires vs the early 2 wire design so as long as you locate the right wires you should be good...
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so basically you would take L and S and only use them on the 2g alternator.
this is only if the 2g alternator has an internal regulator... I'm not 100% sure if all of the 2g turbo cars had internal regulators or not, but if the regulator is built into the ecu like on most modern Chrysler cars, but if it is you can wire in the older external regulator which is what I did on my mirage back when it had the 1.5 motor in it, I was running a 130 amp unit tho from a v6 02-04 I wanna say Chrysler 300m it was way over powered for what I needed but it never failed on me I just got bored of the 4g15 lol.
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Above is the wiring diagram for using an external voltage regulator, if you decide to get a non internal regulated alternator for your car, the voltage regulator came out of a 1985 dodge ram w350 but many of their older Chrysler cars used this voltage regulator so you could source it elsewhere.

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 Post subject: Re: 1g and 2g alternator
PostPosted: Sat Dec 10, 2022 10:53 am 
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Spends Too Much Time Under The Hood
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Joined: Tue Aug 23, 2011 4:20 am
Posts: 316
Location: Turlock, California
Update: So i recently managed to try my information above and can confirm that it works i made a patch harness to adapt an early 1g/gvr4 and 3g csm etc 2 pin wire connector to the newer 4 pin 2g style alternator pigtail, so essentially you can use a 2g dsm spyder and turbo engines only, the 420a are not gonna work with this as far as i know, alternator in an older car you simply get a 2g style 4 pin pigtail you can get them off many other mitsubishi cars lancers 3g eclipses galants etc, and then locate a 1g male style alternator pigtail, i got mine off of an older infiniti j20 they use the same connector in their cars, by the fuse box, for the wiring, you wire L wire to L wire, and S wire to S wire and delete or tape up the other 2 wires on the 4 pin 2g connector, no external regulator was required, i did have to enlarge the charge wire ring terminal because the 2g uses a larger m8 nut vs the 1g m6 charge wire, by making a patch harness i can now use both alternators on my car, i tested it on a 3g 1.5 csm but it is the same as a 1g dsm gvr4 pretty much any of the older internal regulated 2 wire mitsubishi vehicles.
To make it stupid simple i made a color coded picture of what wires go where. Image
pic upload free

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