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There is a relay for the dash-mounted voltmeter. Check the troubleshooting in the -20 for voltage issues. Page 2-61.

My DVM is not working too well so I borrowed an old analog meter. It is 28.5+ over both which is confirms the mid-white hash in the green. Now because the silicon controlled rectifier (the electronic "switch) in the Duvac induces some switching harmonics, some digital voltmeters will pick up...

Resurrecting this thread for progress. We had thought replacing the burned-out diode between the IGN term on the upper alt to the FLD term on the Twinput solved the charging issues. But over the weekend, prolonged idling caused the front battery to cook, H2S spewing and a hot battery. So...

TB 43-0001-39-8 regarding the DuVac rewiring calls for the voltage regulators on both 6Y1 Leece-Neville to be adjusted to the "HI" position I believe this is in error as the bottom alternator now pushes too much voltage out. It is not in the DuVac/TwinPUT system and it receives its regulation...

Similar to R406a but requires lubricant change. If the old mineral oil isn't fully removed, there can be problems. It might last, it might not. There are 2 distinct problems with conversions, material compatibility and pressure-temperature relationship. The oils used with HFCs cannot...

A 5200 mile road trip through most of the Western United States, visiting the VA hospitals along the way for support of mkcoen's organization. See his sig line for more info. I am but the vehicle engineer/wrench spinner. Just think of me as Scotty (James Doohan) to mkcoen's Kirk. And warp...

Yep. And my main mission now is to repair, recharge and make perfect the 42,000 BTU/hour air conditioning system. This is centered around the beautiful Frigidair/Harrison A6 axial compressor, the longish refrigerant lines (must properly support the joints, any vibration will kill seals), the...

I brought my camera today. And forgot the batteries:cookoo:. Spent all of 5 minuted diagnosing the problem, then 2 hours of traveling to get the part, then do assorted tasks before finally another 5 minutes of replacing the burnt diode (soldered the new one to the old leads, didn't want to fry...

Outstanding idea. Because the bottom alternator is what the voltmeter is reporting. And the 1010 has no generator lights, only the voltmeter. Now we were talking about a 12 volt outlet (lighter socket style) so a cheapie which plugs in there would do the trick! Cheap, simple and minimal...

I don't remember but mkcoen has spares and will post tomorrow. I think Catalog #: 276-1144 which are 1N5404 but that may be wrong. They look right. I do have a few onions now...and a dozen quarts of premium egg nog :-P. Yeah, what to do with 50 pounds of onions?

Thanks for the good luck, all that was wrong was one of the diodes, NSN 6145-01-192-1643, GM part number 12006377. Since GM no longer supports the M1010, that is a rare part on the GM network and at least one other has it..Once Upon a Part But it is a COTS diode, original was Motorola which...

Yes, the Harrison compressor is a bulletproof draft horse, it is an evolution of the Frigidaire units. I don't like R134a conversions because of lubricant swap. The R406a refrigerant uses the same lubricant so there is no issue with seals or lines. A complete kit for total charge and...

Thanks for all the help, the downloads did a lot of clearing the "muddy water". Since I can troubleshoot and repair electronics down to component level, this seems to be the least cost repair. Now, onto the M1010s air conditioner! Yes, devoid of any R12 pressure. Since that is $60 a pound...

Cool. I think from the measurements I made tonight the system is working, it is just working too well, overcharging the front battery. I could smell the acrid stench of battery boiling (actually outgassing, it was barely warm to touch). The -34 TM detailed adjustment, showing the front...

I think I know how the Duvac works. The Leece-Neeville alternators are 28 volt, 100 ampere. The lower unit feeds into the 24 volt battery system directly while the upper alternator feeds into the Duvac which reduces the voltage to maintain the 12 volt subsystem, regardless of load. The...

If you don't want to drive to the other side of San Antonio, Thrash is on West Avenue. They rebuild and balance. But they just might have one in stock.

You want me to give the brakes a looking over? 26k means they should be fine, if that is all highway. But if not highway miles, the rears could be toast. These vehicles have a ride height proportioning valve so the rear shoes could be gone. Probably due for a front bearing pack too. The...

So the fuel pump MUST be good. No "water in fuel" light means we got all of the water. Time to change your signature line :-P

Stand by for good news...:-o

It was fun...well, all but the pain of GoJo on open cuts. I looked on the MAC of the -20 and it shows 1 hour for fuel tank replacement? Impossible. Now for the good news. Two parts: To prevent the engine from running when priming after a fuel filter change, pull the pink wire going to the...