Sierra 18-5966 Alternator
- Brand:
- Sierra
- Part no:
- 18-5966
Where to buy
View on Amazonpaid link
Specifications
- Output
- 55 amp
This is the Sierra 18-5966 alternator, rated at 55 amps with a single groove. It fits GM 4 cylinder engines from 1982 on, and GM V-6 and V-8 engines from 1982 to 1996. It replaces Mercury 817119A4. Sierra has discontinued it and superseded it with the 18-5966-1, so that is the number to look for now.
Our take
A 55 amp rating and a single groove tie the 18-5966 to GM 4 cylinder engines from 1982 up, with V-6 and V-8 coverage to 1996. It has been discontinued and replaced by the 18-5966-1, so treat that as the current part.