Mercruiser 2.5 L 153 ci 120 HP alternator

tannergallant123

Seaman Apprentice
Joined
Jun 21, 2023
Messages
41
Hi guys I have a Mercruiser 2.5 L 153 ci 120 HP. The alternator on it I believe is for a car engine and not marine rated. Can someone confirm with the picture below? Also if it is a car alternator could you potentially give me the proper part number for a marine rated one. Thank you
 

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kenny nunez

Captain
Joined
Jun 20, 2017
Messages
3,337
Sierra marine # 18-5946 or 18-5956
These are marine alternators that have the flame proof shielding.
No core required.
Your alternator is not marine approved.
 

Candy Gramformongo

Seaman Apprentice
Joined
Sep 14, 2024
Messages
43
Kenny, if you don't mind, where are you looking to see it is not approved? I have the same engine, same vintage, as OP and I would like to verify mine is approved.
 
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