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Hey, I went to the link you provided. I did not find any instructions or diagram posted. There is just a minor conversation about his solenoid getting hot after jumping. Nothing useful here...

The ST88 is the battery switch solenoid, and the SAZ -4401AA is a double-pole solenoid/relay with the (I) initialization & (S) start contact poles. NAPA does not have this exact relay and could not cross reference this part number. They did have the ST420 which is the exact same relay w/o the...

The ST88 is continuous. I believe the other one is too. If anyone knows more about the other solenoid and part # and voltage, sound off. I won't know until I cut it out. I bet it is the one that has gone bad, but I'm just guessing until I get busy.:confused:

Actually, $100.00. The ST88 was $80.00 at NAPA.

Got both solenoids. Not sure about the part # on second one. Assuming it is an ST43 which is 12 volt. I'll have to cut the original out to see the part number. I'm going to review the schematic and test on the bench first to see if I can isolate which one it is. Hopefully it is one or the other...

You da man! Thanks for all the help. I will report back on what I find and how I fixed it. I'm very lucky that this did not happen in WalMart's parking lot. I noticed it failing several days ago. I would initialize power, then I wouldn't. Luckily, it had a few extra start iterations left before...

Okay, that is exactly what is going on. I'm going to put the 939 box back and follow the jumper start instructions. But first, I'm going to NAPA to see if they have the solenoid or relay in stock.

Thanks everyone! I plan to diagnose the control box fault this morning. I'm going to remove the 809 control box and put the M939 4004 back before I jump. It's either the solenoid or the relay that is bad in the box. Off the top of my head... it must be the relay because there is no power to my...

10/4! Can you think of a work around? I've got this 939 box open. It appears to be a Faraday protected box. The ends are soldered on with a copper gasket. It's like sweating copper pipe together.

Can you think of any other protective switch points that could break the starter control loop? I can tell you right now that some N.C. switch is being forced open due to the differences in the 4001 control box. I'm not familiar enough with the 939 series trucks to have a mental picture where I...

That makes no sense. So, the ABS might be locking me out? That doesn't sound right? I wouldn't think that ABS would create a system fault to keep you from starting the truck? I'm going to look at the electrical schematics to see if I can find everything that might be in play on this. As far as I...

I've got a bad control box on my M929/A1. I knew it was the control box, but I went ahead and did some electrical tests on the ignition switch to the neutral start switch etc... There is no 566 lead to the alternator for lock-out on this truck. So, I had a spare control box WSU 4001UT which came...

I don't see my latest post, maybe it will show up. Anyway, the lifting eye is right there on the headache cross member.

I can't believe it. The answer is right there and I couldn't see it. See, that why I ask because I was about to weld up a hoist arm with a HF chain hoist. I'll still do the hoist but weld the a hook to the underside of the dump bed head cover, then I can use the hoist for a variety of things...

What is needed to complete the spare tire hoist etc...? There is no boom or hoist winch on a 929, just the flange plate covering the vertical tube. Do you attach the same hoist kit, or come up with something custom? Looks like a trip to Harbor Freight my be the best option. I need to be able to...

Lube Service Well, now let's go down the LO maintenance list per LO-9-2320-272-12 (M929/A1). - drain and refill the hydraulic reservoir. - check drain and top off differential oil (all axles). - grease all points GAA - oil can all points and then some with OE/HDO. - oil all axle & crank case...

Okay, so it's normal. After I asked this question the other day I went out to shift it while parked. It was smooth as ever to my surprise. I guess smooth operation depends on locking and how the gear mesh is lined up for a smooth shift. I found that shift slow and easy works best.

I searched the forum on "hard transfer case shifting" and found a lot of good discussion on the topic. Maybe what I am experiencing is normal operation, but thought I would ask the question again. I'm not sure that I am having any problems but here's how my truck acts when you shift from high to...

So, where is this place? I'll put it on my calender.

Yeah, I need to try my 1" impact to see how effective it is without a larger air reservoir.