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Good thing they are easy to change! I have gates belts on there and it was still squealing the drivers alternator even when guitar string tight until I changed that pulley. The factory pulley had quite a bit of wobble for some reason, this truck has a take out engine from another vehicle I...

For those that are wondering this is the pulley I used https://brillman.com/product/alternatorgenerator-pulley-38-10mm-belt-width-x-2-933-od-x-17mm-id/ One of the alternators that came with my truck was aftermarket and the (very important) factory alignment spacer that comes behind the fan...

I will post all the details, I need to do a proper write up with pictures and will do so after work when I can do that properly. Stay tuned!

So after checking all of my connections with out any obvious answers. I found a machined steel pulley that is within a few thousandths of being identical to the stamped steel unit. It's only $15 so I figured it was a cheap experiment. After swapping it in and checking for precise pulley...

I will check into this. Are there any new solid steel pulleys that work? I have a source for core alternators but I don’t want to have to risk getting a bad pulley

They did it because the original card crapped out. I’m going to eventually get a new card in there and revers it. There are about 50 other nagging issues that are taking my nickels and dimes in the mean time.

Ok good to know, my glow plugs are on a manual push button and work flawlessly (another mod done by the prior owner). I will stay on the course you outlined in post #4

Yes mine is setup as you described. So if I understand correctly, the stock resistor is only getting use when the glow plugs are active?

I am considering this, or potentially going 12 volt using one of the methods outlined by Roscommon. I would like to understand how splitting the system with the bypass loads up the alternators. I need to study up on the effect on amp draw on both alternators by doing this. I want to bring this...

they are the gates belts recommended on this site. They are all in the middle of the adjustment range and a couple of months old

This all seems logical I’ll check it out this weekend. Thanks for the advice!

Thank you for the reply, yes they are both group 31 batteries purchased in 2022. They tested fine when I got the truck about 4 months ago. I will re test to confirm. what do you mean by putting a volt meter on the block? I you saying to check for voltage drop through the headlight circuit? or...

I apologize if this has already been covered and I'm beating a dead horse. If there is already good info on this please direct me to it. My truck came to me with the resistor bypass already done. When ever I turn on my headlights I get belt squeal. It's still happening despite tightening up...