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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.

Ok will give er a try

So my m931a2 shifts early compared to m923a2 and doesn't seem to downshift when needed, any ideas.

You r absolutely correct, I took it off n cleaned it, works great, THANKS!!

So when you get about 70ish psi it allows you to use the air horn, wipers, 6x6 switch, etc. What tells it to do that? My m931a2 currently sometimes works n sometimes doesn't. Also, how to I adjust the air pump, mine goes to high.

Well sandcobra164 you where correct, I could unhook the signal line n would build air, hook it up n it would leak out the dryer, so I unhooked it n blew compressor air threw the line, tapped on connections, hooked it back up, and it's works! Thanks for the help everyone! ��

Ok, will look into that also, thanks, if you had any pictures that would be amazing too.

Ok will do

Even tho I just rebuilt the entire thing? Any recommendations on where to buy or part #?

Air issue M923A2 6x6 Ok, so the weather finally warmed up and I finally had time to start this beast. Started up, air went to 120 psi, hit the breaks a few times, air built back up, hit the breaks a few more times, heard a click and then it will not build psi and air leaks out the bottom of air...

This morning I got to 120psi n then air came out dryer, this afternoon I got to about 70 n air started coming out dryer. Once it starts coming out of dryer it doesn't stop, hense the reason I rebuilt it, but if I let it sit for a few hours it will build pressure one time and then it will...

Ok, so just let it sit for a few hours, started it up, it got to about 70 psi and then opened the valve on the bottom of air dryer, just a few hours ago it got to 120 and then opened the valve on the bottom of air dryer. I just rebuilt the entire air dryer a few days ago thinking that was the...

Ok, I'm going to have to Google unloader valve because I don't know what it is. Just weird it builds pressure to 120 n then wont keep it there or rebuild it unless it sits for a few days.

So I'm new to this group. I have a bmy 5 ton 6x6. My air built to 120 n then I heard a click behind the dash and then it wouldn't build air pressure anymore and air was leaking out of the air dryer. When it first did it I was driving n pulled over n heard the air coming out of the dryer so I...