usually it is not the serpentine belt that fails, it is a tensioner or pulley that fails and throws the belt.

 

Thanks for the comments everyone I read carefully every comment it helped me to make a decision I will try the gate green belts that will be a worthwhile start.

 

Let us know how the quality belts work.

 

I will get back to let you all know my results thanks.

 

you have a misalignment somewhere.
or the pulley is at fault not the belts.
v bellts like to run in very strait lines

if you have a worn bracket or a pulley that is not the pulley for these belts , you will get this problem. suppose for sake of argument the pulley on the alt. or the alt itself were installed from a rig with different spec belt you will get this. v belts should not be run too tight, that actually aids them climbing out of the pulley.
read up on v belt adjust. a 90 degree twist on the belt and its tight as it should be.
buying matched sets is a must if not the belts will fight each other

 

These are excellent points you're making I'll consider each of them and I like the the last point you made about by matching sets thank you for your input very good.

 

Which one of the belts seems to be stretching? As was said, the one on the alternator is a real flopper at idle, smooths out as rpm is increased. This belt is often over tightened to try to stop the flop. I hold the alternator over by hand and tighten the adjuster. Check play at midpoint and should be about an inch. Don't over tighten it.

I have the dual V-belt power steering belts. Two side by side and even when I replace them with new one is always tighter than the other. On this double vee I do go a bit tighter on the smaller tighter belt. Once while going up a very steep hill one of those long belts crawled up and out. When it did it got caught in the other belt wrecking both belts. No worry as I always replace both of those at the same time.

Good quality belts is good advice. I have been getting mine at NAPA. They seem to last a long time. I don't know what brand they are.

 

So my truck has a dual pulley alternator the first pulley drives the vacuum pump the second the alternator and water pump I've changed the belts several times only using cheap auto parts store belts so I'm going to go with a better quality belts I'm having issues with all three belts power steering pump only has one pulley and also a issue with AC compressor belt when I bought the truck 4 years ago from previous owner I suspect he knew about the belts but didn't mention them I changed the three V water pump pulley from another truck it didn't seem to help took the bottom 3v pulley off engine balancer looked at it carefully look like the original because the paint wasn't even Disturbed were bolts up so again my plan will be replacing all three belts with a much quality belt I thought of Napa May check with them got a lot of irons in the fire right now so I'm kind of slow at getting around to it but I will report back with results thanks for chiming in.

 

Yeah, double belt alternator that drives the vacuum pump. Check.

I haven't seen too many double belt power steering pumps. My truck came without AC as ordered. But somebody in the factory slapped an AC info sticker on my grill support. So I have wondered if I had a hybrid set up between AC and non AC on my PS Pump belts.

 

I put a set of Napa premium xl (?) belts in about 8 years ago, I think I tensioned them once after and that’s it. I don’t make as many miles as others do, but I’ve had zero trouble with belts. Yep they jump around like there’s a party goin on, but that’s just how they are.

At that mileage there ain’t no way your pulleys are worn. V belt pulleys don’t wear out like serps do. If you say the belts are sinking too deep, you might be getting the wrong belts or somebody has changed pulleys before you for whatever reason. Is it possible you’re getting them too tight?

 

I have tried several ways to tighten these belts somewhat tight and I've also tried 1-in Slack between the center of the belt and still have the same problem I described so I'm going to try a better quality belt and then I'll report back my results thanks for your input.

 

I have heard of running v belts too long and the rubber gets hard and then wears out the pulleys by abrasion. Widening the v groove. I think you could see that kind of wear by inspecting the pulleys. I try to run mine long, if it works don't fix it, but I do replace cracked or worn belts when I see that. I checked my belts that I got from NAPA. Premium XL they are. Been on my PS Pump for about 15 years now, many many miles. They look great.

 

thanks for your comments it's interesting that you said the pulley itself wears from abrasion because I took a good look at these pulleys of mine and I see a thinning along the V of the pulley when I compare it to some I am going to try a much better quality belt to start with because I've been buying Auto Parts cheap belts I have actually took the belt new and laid it in the pulley and it sinks into it deep enough where the top of the belt is below the top of the pulley these belts and pulleys work pretty hard I would say so I think your spot on.