3 wire alternator

[heven67]

Hi Folks
I have a small problem with my alternator and have exhausted my options and am up to guessing, I bought a 220A Powermaster alternator but the belt slips really bad even at idle.
I done 3 belts and a new 130A alternator and a old standard 95A unit and the 95 doesn’t slip but the others are terrible, the pulleys get HOT.
I wired the sensor wire direct to the power out terminal as the instructions on line, but I noticed they are 95A instructions. I was wondering if I move the sensor wire closer to the battery.

[my67xr]

I've seen this happen a couple of time's
It's usually caused by not enough tension on the belt,
Try putting a medium ratchet and socket on the alternator pulley nut and try turning the nut clockwise, it the pulley/nut turn's then the belt isn't tight enough.
You want just enough tension so the belt doesnt slip, but not so much tension that the waterpump bearing's will suffer.
Some fan belt's don't sit right in the pulley's too they can bottom out in the v section

[heven67]

I forgot to mention I’m using the serpentine belt, I’ve put a 15mm ring spanner on the adjuster while it’s running and increased the tension to no avail.
I’m thinking it may be the sensor wire somehow sensing low voltage, I will run a wire direct to the battery and see if that’s what is happening.

[slowsnake]

Have you measured the pulley dia?sounds like it may be smaller in diameter, I remember I replace a idler pulley on my Au2 and it was 1mm bigger in dia, new belt, but geez it was tight to get the serpentine belt on, ended up putting too much pressure on the water pump pulley, screwed the bearing in that, it had 5000 klm on it, other than that I really hope you get it sorted out.

Regards Billy.

[Crazy Dazz]

Originally Posted by heven67

Hi Folks
I have a small problem with my alternator and have exhausted my options and am up to guessing, I bought a 220A Powermaster alternator but the belt slips really bad even at idle.
I done 3 belts and a new 130A alternator and a old standard 95A unit and the 95 doesn’t slip but the others are terrible, the pulleys get HOT.
I wired the sensor wire direct to the power out terminal as the instructions on line, but I noticed they are 95A instructions. I was wondering if I move the sensor wire closer to the battery.

Helps to begin by telling us what car and engine it is...

Check that you have matching width and number of grooves on your pulley & belt. I think most are pretty standard with 6 grooves, but you never know.

Check your alignment. Everything should be in the same vertical plane. (On my old EB, things somehow got out of alignment, and it would chew the belts)

But yes, ultimately, a 220A Alternator is going to put a much bigger strain than the OEM.

And yes, unless its specifically designed for your car, fitting a high-power alternator to a modern car, can be a nightmare.