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I just came across and bought these vintage print ads from 1981, 1982, & 1983 featuring what AM General was marketing as their ATAC lineup of trucks. It looks like they have CTIS like the next generation M923s came with. This looks like more than just a prototype test mule and it looks like a...

Glad you found the problem and thanks for circling back with the fix

The military rigs start at 2:30 and mine is in the rear of that lineup at about 4:30 and that's the last MV.

Thanks! - I like it. Here is the write-up I did on it a while back.

Side note: I added a 6 gauge ground cable back to the battery and that cured the whine in my VIC-1.

This intercom is still one of my favorite additions but I had some whining in the background that would change with engine rpm which sounded a lot like a turbo whistle. Some folks in the radio forum found that grounding the amplifier itself to the same ground as its power source would eliminate...

Are you talking about a fuel pump or water pump? I'm afraid I don't have any good answers to your fuel pump questions other than mine's doing fine without an AFC. This is a thread about an unusual heater core install and you'll get better answers to your questions if you start a thread...

I drove my truck to the Sunday potluck like you read about in the pioneer novels. I took all the teenage boys for rides with turbo whine & jake brake action and then told them to make sure their moms buys themselves an army truck😉... The truck ran great all day and I didn't have to downshift...

I briefly ran the truck yesterday just parked in the yard and the gauge was steady as could be. Alternator output was also steady at 28.52 volts. Could be the previous behavior was a fluke or I'm starting to see intermittent erratic gauge behavior which would point to a failing gauge, right?

My 90° elbow hose finally arrived - it's a Gates 28466 which starts out at about 4" x 6". I trimmed off about 2" per end and it went on like a glove 😁 I cranked it up and idled it for awhile until the filter got warm. Only two leaks to tighten and everything is running good! I'll be running...

I finally drained the radiator so that I could install the shutoff valves from the coolant heater kit; one on the water manifold with the included pipe bushing and one on the oil cooler in the existing pipe bushing. A section of hose connects the supply side and on the return side it's waiting...

M818 with shop trailer here's a fun article on the generation prior version with some good photos...

So I tried removing the voltage regulator with the alternator still mounted and I couldn't get the 6 O'clock screw out with a flat screw driver of any kind. If that screw had been an indented hex or torx or something else I think I could done the job while mounted.

I think I have the bulk of the heater hose plumbing worked out. Following the instructions for the filter install and the advice of some over-the-road truckers I'm going to tee into the filter with the heater hoses so that there will be a bypass route if either the filter or heater core get...

I looked through those posts and that does look like a clean, simple upgrade. Does that setup have just a 1 wire hookup?

That's a pretty epic horn! Someone's gonna soil their britches when that goes off

Thank you - I like it a lot! Too bad I didn't hit the jakes in the video, but I will next time 😁

The gauge could be crapping out but it's suspicious that it only bounces when the alternator is spinning.

Beautiful day for a drive, but the camera memory ran out before I could get to a place where jake brakes are allowed...next time

Anything is possible. It's an old alternator with a new voltage regulator that was burnt up inside...