Extra idler wheel for alternator to stop belt squeal

After changing to a big 145A alternator, my belt now squeals at startup..
I know, known issue even on stock alternator, allthough mine didnt before i changed Alt., and i have thoughts about improving and hopefully make the belt stop slipping..
Slipping at startup only tells me that the belt is slipping at high load, and probably also will do that while winching.

I want to add a extra idler wheel underneeth the alternator, between the Alt and the main pulley, to make the belt cling onto the alternator pulley longer / more degrees.

Has anyone done this allready, and could provide info on parts i could use perhaps?


I`m running a standard size alternator and pulley, it`s only internal upgraded to give more amps. (Bought from Ebay).
New belt, new main pulley, all clean, all tensioned up etc etc, this is not a n00b issue, i just want to upgrade it

try a bit of belt prep spray, works wonders that stuff

Agreed as a long term solution you need something better. Is there any spare threaded holes on the engine block that could be used to attach a bracket in that area? I have the old 1.3 vvt in the garage that I could have a look at tomorrow for you.

Which engine is in the car? The m13a suffer from crankshaft pulley failures and squealing belts can be a indication of this, especially as you have put more strain on the system.

Riccy wrote: try a bit of belt prep spray, works wonders that stuff

Agreed as a long term solution you need something better. Is there any spare threaded holes on the engine block that could be used to attach a bracket in that area? I have the old 1.3 vvt in the garage that I could have a look at tomorrow for you.

My first plan is to use one of the bracket bolts for the alternator, or even the main alternator bolt.. But i might have to weld up something , not sure.. Was just hoping for somebody else to have a similar solution, as it takes time to be first!

mickt wrote: Which engine is in the car? The m13a suffer from crankshaft pulley failures and squealing belts can be a indication of this, especially as you have put more strain on the system.

M16 swift sport.. Brand new stock crank pulley and belts.
Only makes a noise at startup unless i switch off my lights first, which tells me it has to be slipping on the alternator pulley.

I dont expect it to work 100% with a stock setup as ive doubled the alternator size, hence the reason i look for a way to upgrade it even more..
And i believe a second idler wheel would upgrade this properly with more grip to the pulley.

I'm interested in which alternator you installed. Was it one of the Jimny specific ebay aftermarket ones? I am tempted to try one but was worried about the physical size.

I'll be following this to see if you solve the squealing problem.

Edit: Sorry. Just read the last part of your original post.