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JohnRichard

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89 Cadorette Holiday 200 4.3L OMC Cobra

Had an engine swap done and noticed this year that my gauges are weird.

- Tach isnt accurate (verified with timing gun/tach)
- Trim isn't calibrated properly
- Oil pressure gauge reads really low
- Dash lights dont work
- Speedo is off (although it is old)

They all "work" but none seem accurate. Is there a ground wire in the dash duster to look at? Or anywhere else?

Boat runs pretty fine and starts, shifts, functions normally.

Any idea where to look?
 
JohnRichard said:
89 Cadorette Holiday 200 4.3L OMC Cobra

Had an engine swap done and noticed this year that my gauges are weird.

- Tach isnt accurate (verified with timing gun/tach)
- Trim isn't calibrated properly
- Oil pressure gauge reads really low
- Dash lights dont work
- Speedo is off (although it is old)

They all "work" but none seem accurate.
Is there a ground wire in the dash cluster to look at? Or anywhere else?
Click to expand...


Yes, there is a Negative circuit at the helm.
("Ground" refers to Earth Ground as in with Alternating Current)

This Negative is supplied to the helm via the engine/hull harness.
There will be a multi-pin connector (typically near the engine) that joins these.
Pull the connector apart, and examine the contacts.

Also go to the helm and examine all Negative connections.
 
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