Mercruiser 3.0 no start after new battery

[GrannyDP]

Getting reading for the summer (De-winterizing) our mercruiser 3.0 we got a brand new battery. After we installed the battery we got no power, not even to the dash. All the fuses were good. The trim would work however. Then Paw remembered that for a split second he put the battery in backwards (reverse +-) We are hoping that his mistake caused the 90A fuse to blow and all we have to do is order one off Amazon for $25.00. Hopefully that is the problem .... I will let you know.
Thanks
Granny DP
DPForumDog

 

[alldodge]

You can hook it up without the 90 amp fuse to test it out. If all good, install it afterwards

 

[Chris1956]

Some of those Mercruisers had a red circuit breaker reset button on the engine.