1997 Mercury 150 EFI cutting out 1997 Mercury 150 EFI cutting out
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    1997 Mercury 150 EFI cutting out
from 884savage #12059 #12059  
6/30/2012 8:59:45 PM

Rated:

 For years this boat has had this issue pop up. I can be running along at speed, and out of the blue, the engine will seemingly stall, but when I come to a stop, the engine is still running. 5 yrs back, I took it in, the mechanic swore it was a bad battery. He replaced it, and said if it didn't fix the issue, he'd give me the battery. It fixed it. It happened again this last week for about the 4th time. I put in a new battery even though the battery was purchased last yr. This time, it still stalled out, and when I got back to the dock, the battery was fire hot. I hooked up the battery to my onboard bank, and it wouldn't read anything. The next day, absolutely nothing worked. The trim wouldn't work, engine wouldn't crank, I had nothing. 2 days later I attached the cables again, and the trim worked long enough to lift the motor to trailer it. Any guesses at all as to what could be going on? Thanks.


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   clean terminals from Dwight #10907 #10907  7/1/2012 8:47:28 AM
 Clean all the terminals until they shine. Make sure to clean inside any cable clamps and terminal rings and then hook them back up putting motor cables on first then the others largest first to smallest on top treating all with dielctric grease. I don't know what causes it but the newer batteries get a gray film on the terminals and thats enough to keep them from working.


   hot bat from Guy #10385 #10385  7/3/2012 8:10:00 PM
 sounds like an over charge from the alternator. pull the cowl and inspect the voltage regulators. look for burned and blackened wiring.the alt. windings under the flywheel can also be burned sometimes the tach can be erratic or stop working. If you find this condition, do not run engine,some have caught fire!
always replace the vr's in pairs.
let us know what fixed it.


Guy


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