1986 Johnson 150 j150tlcdc

[bajabassboat]

My engine has a wire block on it where the tach wire (gray) is connected to the third post down from the top. My tach is intermittant. Now on my old evinrude 115 ( that I replaced with the johnson 150 ) it had the same kind of wiring block. My gray tach wire was connected to the first top terminal (not sure what color it was on the evinrude) . When I took it to the shop for another reason the mechanic pointed out that it should be on the third terminal for gray but when I did move it the tach became intermittent so I moved it back to the first terminal and the tach worked perfect again. So should I move the gray wire from the third spot on the wiring block of the johnson to the first position which is were the yellow wires are? I assume the tach is wired wrong?

 

[itsaboattime]

Re: 1986 Johnson 150 j150tlcdc

On my '87 evinrude 110 the grey tach wire is on the third terminal like your 115 was. The third terminal has the grey wire that comes off the Regulator/rectifier. By connecting it up near the top, where the yellow wires are, the tach is running off of voltage that comes off the Stator, under the flywheel.

You may want to look in the FAQ section and check Joe Reeves entry about testing the rec/reg. There is a reason sombody connected it where it is connected. My hunch is the Reg/Rec is bad and they moved the wire to get the tach to work without replacing the the Reg/Rec.

 

[emdsapmgr]

Re: 1986 Johnson 150 j150tlcdc

The 1986 factory wiring diagram shows the grey tach lead to the dash on the 4th terminal down. I believe that the 4th and the 3rd terminals share a common stainless buss under the two screws, so it should not make a difference.

 

[bajabassboat]

Re: 1986 Johnson 150 j150tlcdc

Ok I'll check it. I don't ever see the voltage gauge go above 12. I have a 3 bank charger on my boat that I plug in every night. 2 for trolling batteries and one for starter battery. If the regulator is bad and not charging the starter battery I wouldn't know it. Question will it hurt my tach or stator or anything to change the gray wire to the yellow post at the top? I want my tach to work but I really dont want to spend $300 for a new rectifier.