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I think your mixed up about how its supposed to work. If your truck has stock alts, they are 24v. The 24v alt(s) will charge both batteries at the same time in a series. The battery equalizer is used to supply a stable 12v power source for the 12v systems of the truck. 12v source is also tapped...

Wow, those new Sure Power units look cool. I think your wires are undersized given the 100 amp potential that the DUVAC never had.

YAY, no more duvac for you! What are you going to use for 12v?

Check the regulators on both alts. Just be careful when you reinstall them as the metal prongs can push the metal sleeves into the housing on the alt if your off center. In which case, you'll need to take it apart to reseat the metal sleeves. I believe my two are at the middle position. You...

Is the duvac removed? How did you rewire the top alternator?

Also, it is not uncommon for the equalizer to run for a period of time to "equalize" the charge. This is normal. But do make sure to keep that master light switch off when not in use. Otherwise, you will drain your batteries. EDIT: led ON = 12v draw So, either your front battery is...

When the truck is not in use, set the master light switch to off. When on, there is a relay that is ALWAYS drawing power. This is related to the rear lighting in the M1010.

Neg terminal of rear battery since you want the full 12v amperage of the Sure Power available to charge the battery (equalize) as needed.

acmunro - read post #3 above again. It's purpose was to charge the front battery which provides your 12v power source. If you don't have the DUVAC working, then you need a stable source of 12v for your truck otherwise your front battery will drain. There are two good options depending on...

Sure Power 52210 Battery Equalizer I went with the 100 amp unit and took the last one they had. However, you may still be able to order one from them. Alternatively, you could go with the 80 amp unit which should be sufficient and there are two in stock. Sure Power 52208 Battery Equalizer

Oh yea - check the TM - there is a wiring diagram for the standard CUCV charging setup as well as one for the M1010. Once you compare both you will see the differences quite clearly.

The M1010 stock setup is two Leece 24v alternators mounted on the passenger side. The DUVAC is essentially two units, a twin input voltage regulator and a battery isolator. It is supposed to sense when 12v is needed and pulse the top alternator on and off many times a second to create a 14v...

As with most M1010s, my "shark" had the same 12v charging issues. I tried the wire swap trick and it didn't help, so I bit the bullet and bought a Sure Power 52210 battery equalizer and some auto reset breakers. Yesterday, I removed the DUVAC and the related wiring. I then rewired the top...