new alternator overcharging

Roy Burrill

New Member
Jul 2, 2020
10
Boat Info
97 sea ray 280 sun sport
Engines
Twin mercs 7.5 350 hp
I have a pair of 97 merc cruiser 5.7 LX/V8, i had an issue with my alternator, it was over charging on the gauges, it also sounded like marbles spinning around inside. Got a new alternator and for about 2 minutes it was charging normal just between 12 and 14 amp then it pins to 16 . the other gauge is charging normal...any reason why this is happening??
thank you
 
The picture shows the wires for this alternator
 

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My gauge also reads high. My plan is to replace the gauge.
 

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