Tach inop until tilt operated

redfish51

Recruit
Joined
Mar 4, 2011
Messages
3
H'lo, mates,

Been like this for at least 5 years. 1990 Mercury 135 - dead tach until tilt is operated, jumps right to attention w/ proper RPM, then quits again within 10 seconds. Can duplicate all day long. Tilt switch at the engine is balky at the beginning of season, esp down. Have to keep stabbing it until it works, then works OK for the season. Never tried tilting/trimming at the engine to see whether it does the same with the tach. Is there correlation? Connections seem clean between the control console tilt switch and the tach. Your thoughts are welcome, especially if you know something and not just blowing smoke! :<) TKS!
 

j_martin

Admiral
Joined
Sep 22, 2006
Messages
7,474
Re: Tach inop until tilt operated

Tachometer power and tilt power fed by the same defective crimped or scotchlock splice. Spark jumping from trim makes the connection till the next bump.

The first thing I do when I buy a boat is get rid of every crimped connector in it and replace it with soldered and properly insulated connections.
 
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