alternator belt

[andy120]

what size anlternator belts are you using. we have 15a1030m but they run out of tensioner slot before being tight. i have tried the next size down, but its way too small to get on. has anyone extended to slot further outboard?

andy

[pig75]

I'm running a 17A1055

[andy120]

darn thats an expensive belt!

[geeves]

Mine is a 15A-1015 on a 4jg2. However it is very tight to get on new. Most part books quote the same belt you have but it is too long

[stardog]

i found there are 2 sizes with those numbers 1 is tight the other is loose.

[geeves]

I struck that a while ago Cant remember the brands but my thought was that one measured the outside of the belt

[andy120]

Found the real issue. The slotted tensioner had been broken at some point and welded shorter.