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Thread: Tach Not Working
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08-18-2019, 07:08 PM #15000 RPM
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Tach Not Working
Started this OB up for the 1st time after OB mechanic got it running very nice.
all my gauges work except my tach. I have confirmed their is power to the tach.
I dont want to smoke my brand new tach just by connecting each empty wire on the OB.
I would "assume" its one coming out of the ECM, but you know what happens when we ASSUME.
How to proceed?
1996 Merc 225hp carb'edIf you think this is fun, wait til next weekend!
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08-18-2019, 07:32 PM #2
Grey wire in harness is tach and it hooks to the rectifier or voltage regulator at the motor.
RockTeam Junk
No sparkling wiggles in here, only dump truck grinches.
"Screamin Heathen"
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DEN thanked for this post
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08-18-2019, 07:34 PM #3
like rock said grey wire to rectifier ,when tach goes down test rectifier cause its probably toast
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DEN thanked for this post
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08-18-2019, 08:02 PM #45000 RPM
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i take it rectifier and voltage regulator are the same?
I do know mechanic installed a new voltage regulator.
Ill check this out...thank you!!If you think this is fun, wait til next weekend!
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08-18-2019, 08:36 PM #56000 RPM
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Would almost take it back, nothing should be left disconnected when you pay.
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olboatman liked this post
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08-19-2019, 08:59 PM #65000 RPM
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Thank you guys!!!
It was the grey wire. tach now working!If you think this is fun, wait til next weekend!
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