Mercury sportjet 175 xr2 rectifier problem

[Boatymcboatface420]

I burned up two recrifiers last summer. Im fixing to start workin on boat for this summer? Anyone know what the culprit coukd be to cause multiple rectifier failures?

 

[Chris1956]

What year motor? Different years had different charging systems. Some had rectifiers, some had voltage regulators, some had both.

Rectifiers blow when the battery and ground are not making a good connection with the rectifier.

 

[merc850]

Boosting a low or dead battery, bad grounds in motor, using a deep-cycle battery.

 

[QBhoy]

Plus one on boost/jump starting being the main cause of this. Happens when jumped off a running car or truck.

 

[merc850]

Connecting the battery backwards for just a second will also fry them.
The marine batteries I've had came with wing nuts (?) to attach the cables - I replace them with SS Nylock nuts that don't come loose or corrode.

 

[Boatymcboatface420]

Its a sea raider 175 xr2 merc sj. Im thinking 98 but idk even know for sure lol. I have a marine crank battery in it. 800 cca.

 

[Boatymcboatface420]

Connecting the battery backwards for just a second will also fry them.
The marine batteries I've had came with wing nuts (?) to attach the cables - I replace them with SS Nylock nuts that don't come loose or corrode.

It could have been the starter ground too. I put a cheapo amazon starter on it. The first one melted before starter and 2nd one after. The 2nd one went pretty quick maybe 3 trips. Then tach went loco.

 

[Boatymcboatface420]

Boosting a low or dead battery, bad grounds in motor, using a deep-cycle battery.

Its 800cca marine super start. Stator couldnt do it could it?

 

[Faztbullet]

Nope....either a grounding issue or loose connections at battery