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I'm also in the same boat with the N1506-1 going out and wanting to go 24v only. But I'm having trouble finding a civvie alt that will fit the existing bracket. SausageGuy, where did you find yours and what make and model was it?

Update: changed out the alternator and voltage regulator and batteries are charging properly again. Gotta say the voltage regulator going out right after I changed the location of the reverse polarity box, is a conundrum... coincidence or cause?? Even though the troubleshooting was a PITA, it...

You make a great point! The alternator cables to the reverse polarity box are the only ones that I haven't changed out yet and I did reroute them when I changed the location of the reverse polarity box. I'll give that a whirl tomorrow. All that said, the regulator still comes up bad during...

Good point. Got a 200 amp off eBay.

:-)

I have an account with them and it would seem that the price has increased..

Well I repeated all the troubleshooting gymnastics and again came to the conclusion the voltage regulator is bad. Does anyone have or know where I can get one of these? Niehoff dual voltage regulator 76761-n3030

fair enough. Certainly sage advice Ronmar, however, I first need to be sure that the regulator isn't bad (which is the conclusion according to the flow charts after my extensive troubleshooting). Once I know that the regulator is OK, then I plan to jump K11 30 to 87A until I figure out where the...

the Niehoff Regulator is actually a little smarter in that when it get Power from its harness and IGN signal from the red terminal it waits till it sees an certain RPM from the alternator phase signal before it powers up the field coil. its call a soft start on some Niehoff units it also ramps...

I don't think mine is that smart....rofl

I am pretty sure that it is wired correctly in that I labelled the wires before I relocated the box. That said, I have wired it opposite to what it is now to ensure completeness and the engine wouldn't start.., I will make a temp jumper from the 24v on the polarity box to the ENG terminal this...

There are no LEDs and I think I have the N1506. At least that is what I've been using to troubleshoot; that and the TMs

I will rerouter excitation wire from fuel solenoid as per Supraman's suggestion. What gauge wire is recommended? Also, because all this started after I messed with the reverse polarity box, could that be bad? How do I test it and is it even necessary to have or can it be done away with? Thanks...

What gauge wire do you recommend when rerouting excitation wire from fuel solenoid to regulator?

I have an alternator charging conundrum on a 1996 M1078 ever since I removed my spare wheel and "cleaned"up behind the cab, the batteries are not charging via the alternator. All I did was relocate the reverse polarity box and remove the ether canister and cut that wire. I've troubleshot the...