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New belt was visibly longer than existing belt, and went on without a hitch!

I got a new belt from Mac Motors today that is apparently 112" long. That's almost certainly longer than what was on there. We'll find out tonight if it fixes the issue!

I'm really thinking wrong belt. The routing diagram is right on the truck and it was definitely routed correctly.

I got the belt completely off, pulled it into a straight line and it measures about 54.25" long. So just over double that length puts it around 110" or so in circumference I suppose.

Its an M1151a1

This is how I received the truck from gov planet so who knows. I've only had it for a few weeks and the engine has run for a total of about 10 minutes.

Yes its on wrong because its not long enough to go on right. It was underneath of that idler pulley before I had the alternator fully bolted in. Dont worry I'm not running the engine this way.

Okay I checked the entire length of the belt and there are no markings. Picture of inside of belt attached.

As you can see, even after bypassing an idler pulley its still tight as a banjo string. This is with the alternator fully bolted in, and the tensioner barely has any travel left. I dont see any markings on the belt but I havent fully removed it to check the whole thing yet.

I'll look for a number, that should have been the first thing I did. But yes its "cogged" with cross hatch looking pattern. Currently trying to get multiple small children to sleep so I'll check tomorrow.

Also my truck came from Yermo with a note on it that said "no belt," but it did come with a belt. I wonder if they just threw whatever they could find on there and unbolted the alternator to make it fit.

On the hummer parts guy website they have 3 different belts, one says its for the 400 amp alternator and is slightly shorter. I wonder if thats what I have? 110.91 inches: https://www.hummerpartsguy.com/BELT-SERPENTINE-HMMWV-400AMP-WITH-FIXED-PULLEY-11091-IN_p_26748.html 112.95 inches...

I should clarify, I was able to pop the belt off one of the idler pulleys and create enough slack to secure the alternator. But now I can't get the belt back on, its as if its too short. The tentioner is completely maxed out. I did some more googling, and it looks like there may be 2 variations...

Okay, and then what? Lol

I looked in the TM's and googled the issue but couldnt find an answer. My M1151a1 was received from govplanet with the alternator not fully bolted in. I'm trying to add the last bolt, but the problem is that I cant get enough slack out of the belt to move it into position. Is there some other...