tach

B

BLAZER123

Recruit
Joined
Mar 27, 2005
Messages
4
1990 johnson 200stl tach quit working. where does it hook to engine? what color wires and where are they located. put new tach on boat, it won't work either.
 
O

ob

Admiral
Joined
Aug 16, 2002
Messages
6,992
Re: tach

Tach gets its rpm signal from a gray colored lead from the voltage Reg/rec.Test across battery terminals first with engine off and then with it running and throttled to around 2500 rpm and note whether the voltage increases from around 12 volts(not running) to 13-14 volts (while running).
 
J

Jilly - 5

Seaman
Joined
Jul 28, 2003
Messages
74
Re: tach

Shouldn't have to go to engine. All tach connections can be made at the ignition switch (ground, hot, rpm signal). Look for black, red and grey on tach and black, red and grey behind ignition switch. Connect 'em up. Of course, if red is dead, you've got another kind of problem.
 
Barnacle_Bill

Barnacle_Bill

Admiral
Joined
Feb 8, 2004
Messages
6,469
Re: tach

Normally a bad rectifier is what kills the tach. The test OB said to make will verify this.
 
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