Mechman 270 amp alt slipping under load

[adjetta 10+ year member]

I had the L series alt installed by my mechanic a few months ago, and i have had a lot of trouble. I can't seem to find a small enough belt, it still slips whenever I put any sort of load on it. I am worried it's not the typical belt slippage issue, after ripping my front end apart I discovered something a bit worrisome. It appears that the grounding lug on the alt was too long and was in the way of the a/c compressor so the mechanic sheared it and grounded it to where it mounts on the rear case instead. I'm not sure what to think, is that lug just a casing mount or is it a bigger problem.

Either way I'm in voltage hell

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[Vertex Audio Pro Seller]

I had the L series alt installed by my mechanic a few months ago, and i have had a lot of trouble. I can't seem to find a small enough belt, it still slips whenever I put any sort of load on it. I am worried it's not the typical belt slippage issue, after ripping my front end apart I discovered something a bit worrisome. It appears that the grounding lug on the alt was too long and was in the way of the a/c compressor so the mechanic sheared it and grounded it to where it mounts on the rear case instead. I'm not sure what to think, is that lug just a casing mount or is it a bigger problem.
Either way I'm in voltage hell

Contact mechman, shoot josh a email at josh@mechman.com. Not sure what they will do because of what the mechanic has done but it sounds like a possible alt issue. Im sure they will be able to recommend where to get some proper length belts.

 

[bubbagumper6 5,000+ posts]

Either adjust the tensioner pulley or get a smaller belt...

I've never had an alt with a dedicated ground lug, they're usually grounded through the engine block or through the addition of one of the big 3 wires (engine block to chassis) so direct to the alt chassis should be fine.