Sierra 18-5956-1 Alternator for MerCruiser
- Brand:
- Sierra
- Part no:
- 18-5956-1
Where to buy
View on Amazonpaid link
A Sierra alternator for MerCruiser engines, part number 18-5956-1, also known as Sierra 59561. It is cross-referenced to several other numbers, including 78403A1, 78403A2, 20102 and 74000, which helps when matching it to the alternator you are replacing. No output rating is given.
Our take
The long run of cross-reference numbers, including 78403A1 and 78403A2, gives you plenty to compare against the tag on your old alternator. What is missing is an output rating, so confirm the amp figure yourself.