Sponsored Links (Register now to hide all advertisements)
Replacing the bearings in your current alternator is the best way to go, I think. To fit another type, you'd have to make new brackets and that alone is probably more work than fixing the old alt.
As for how many amps, when I converted my first A to 12 volts, I did a few very simple calculations:
2 X 55w headlight globes (Halogen) = 110 watts
stop light and tail light, another approx 25 watts
Ignition, approx 35 watts
Total 170 watts. At 12 volts, that is just over 14 amps MAX - driving at night!
I installed a 25 amp alternator from one of those tiny Japanese rice burners of the 1980's/90's with a built in regulator. 40,000 miles later and it is still going. If you're concerned about 45 vs 60 amps, forget it. Either way you're using a sledge hammer to break a peanut.