What current rating for an alternator replacement.

[lsrguy2007]

I have a 1973 Dodge Dart sport with air conditioning. The bearings in the alternator are making noise so I think it's about to go. I see a 60 amp alternator and a 90 amp alternator on Parts Geek. Is the 60 amp large enough to buy or should I go with the 90 amp? Thanks for anyone's help.

 

[jbc426]

I believe your '73 is a dual field unit, and if the outward appearance of the 90 amp alternator is acceptable, I'd go with the 90 amp version. For me, it's all about the output at idle. Many alternators can produce more amperage than folks need at higher engine speeds, but perform pretty poorly at idle rpm. With no power hungry accessories, the 90 amp will be all you will need while providing a little cushion.

Be sure to consider reading the information on Mad Electric regarding proper grounds, adding a fused or circuit breaker protected cable from the output terminal of the alternator to the starter relay post and doing the bulkhead and amp gauge bypass.

MadElectrical.com - Mad Enterprises