"Straight edge shows at least 1/16 off at the alternator
The most common misalignment is probably if the alternator
pulley is pressed too deeply (or not deeply enough) on the shaft, so it is "in front of" or behind the plane of the main pulley. If that is the case with your alternator pulley, the solution is often to have the pulley shimmed or pressed into the proper position. DO NOT use a hammer if you need to press it further in, this will damage the bearings.
Sometimes the alternator feet are mismatched, and you can use shim washers to move the entire alternator forward/back on the engine
in order to match up the pulley as well.
The question is...which way are you out of alignment? And then, to see what the "wrong" thing is. Sometimes someone has kludged up a mounting arm that just isn't right, or bends under tension. Sometimes you'll even find a pulley, shim, or fan blade set installed "backwards" or in the wrong sequence. Anything's possible.
For extra points, while you're in there:
Measure the alternator pulley size, and the main crank pulley size. Get the specs on the alternator output, and now compare the alternator's speed at "charging" "cruising" and "battle" speed to the manufacturer's recommended speeds for optimum charging
, and maximum speed. Sometimes the pulley itself is simply wrong for the installation
, but chosen because it was 'good enough" and a stock part.