Please help identify tach wire.

gunner1

gunner1

Petty Officer 1st Class
Joined
May 13, 2006
Messages
375
I have a Mercury 115hp outboard on my boat. I replaced the tach and wired it exactly as it was but the new one doesn't work. ( The original one I replaced didn't work either.) I used the same wires, but maybe someone replaced it once and didn't use the correct one. Here's a pic:

016.jpg


I currently have the tach input wired to the grey wire in the pic. What are the other ones for? I think the pinkish one is for a thermal alarm, but I can't figure out the rest. Thanks.
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,142
Re: Please help identify tach wire.

It would help to know the year of the motor. The tach needs the grey wire, the purple wire(switched +12VDC) and ground which is usually black. Of course that is only an educated guess.....w/o the year
 
Dukedog

Dukedog

Captain
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Oct 6, 2009
Messages
3,245
Re: Please help identify tach wire.

gunner1 said:
I have a Mercury 115hp outboard on my boat. I replaced the tach and wired it exactly as it was but the new one doesn't work. ( The original one I replaced didn't work either.) I used the same wires, but maybe someone replaced it once and didn't use the correct one. Here's a pic:

016.jpg


I currently have the tach input wired to the grey wire in the pic. What are the other ones for? I think the pinkish one is for a thermal alarm, but I can't figure out the rest. Thanks.
Click to expand...

grey - tach
red/purple - switched hot
black - ground
dark brown/white - trim guage
(pinkish) tan/blue - heat horn
tan - temp guage
 
gunner1

gunner1

Petty Officer 1st Class
Joined
May 13, 2006
Messages
375
Re: Please help identify tach wire.

Dukedog said:
grey - tach
red/purple - switched hot
black - ground
dark brown/white - trim guage
(pinkish) tan/blue - heat horn
tan - temp guage
Click to expand...

Hey, thanks alot for the reply!! Sorry it took me so long to realize you responded, but I never get instant email updates from iboats.com when I'm suppossed to. So since the grey wire is correctly installed, then the problem must be with my voltage regulator, right?
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,142
Re: Please help identify tach wire.

Maybe....the wiring could be bad as well. What year motor? A lot of them didn't have VRs, only rectifiers.
 
gunner1

gunner1

Petty Officer 1st Class
Joined
May 13, 2006
Messages
375
Re: Please help identify tach wire.

Chris1956 said:
Maybe....the wiring could be bad as well. What year motor? A lot of them didn't have VRs, only rectifiers.
Click to expand...

Sorry again for the SLOW response! I'm pretty sure it's a 1995. The tag reads 0G144441. It's a Mercury Tracker Pro Series 115hp outboard. Did these have VR's or just a rectifier? Thanks.
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,142
Re: Please help identify tach wire.

You can look up the motor on the crowleymarine.com web site and see what it has.
 
Don S

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: Please help identify tach wire.

The Merc PN is 883072T and is called a Voltage regulator. Yes, your engine is a 1995.

Here is the wiring diagram for your motor.

attachment.php
 

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