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Great information, just ordered one, only place I found that offers just the regulator was eastern surplus so that's where I got it. Be happy to not smell those batteries. 😝

Nevermind, just looked it up n it's the whole back end

So is the red circled thing what needs replacing?

I just bought this truck so haven't load tested batteries, there is 4 interstates in it but don't know the age. N yes, when truck starts it over charges for a bit, then it charges fine, then randomly over charges, so I'm assuming it is the regulator, will have to try and track one down, thanks

So curious if anyone has had this, M931a2. The generator will randomly over charge. So it will be in the green n then all of a sudden it will go in the red n u can hear the belt squeal n can smell the batteries. N then it will go back to the green.