Charging system question

[Tempest 160]

Hi: I have an 87 Evinrude 60hp (3c) no power tilt or trim, and I'm just trying to confirm that this motor has a 12 pole alternator in it before I buy a new tach for it? I'm a little confused when it comes to what type of tach will work with all the universal units out there. Thanks..

 

[HighTrim]

Re: Charging system question

Tachs read off the alternating pulses from the stator. Any of the leads from the stator charging portion can be used for the signal. The designated tach signal wire is merely attached to one of those. Tachs have rotary switches on the back that set it to different numbers of coils in the charging circuit, times two because there is a positive and negative pulse for each coil for each cycle. Tachs measure pulses. That being said, you need a tach that has the setting that you need designated on the rotary switch. In your case that setting would be 6P.

The BRP tach of the right model comes with a harness that you can plug and play. The Teleflex tachometers offer the harness as well. Check right here on iboats.

Or you can easily wire most tachs, that have the correct settings on the rotary dial of course, by either going directly to the ignition switch or by cutting into the main harness.

 

[Tempest 160]

Re: Charging system question

Tachs read off the alternating pulses from the stator. Any of the leads from the stator charging portion can be used for the signal. The designated tach signal wire is merely attached to one of those. Tachs have rotary switches on the back that set it to different numbers of coils in the charging circuit, times two because there is a positive and negative pulse for each coil for each cycle. Tachs measure pulses. That being said, you need a tach that has the setting that you need designated on the rotary switch. In your case that setting would be 6P.

The BRP tach of the right model comes with a harness that you can plug and play. The Teleflex tachometers offer the harness as well. Check right here on iboats.

Or you can easily wire most tachs, that have the correct settings on the rotary dial of course, by either going directly to the ignition switch or by cutting into the main harness.

View attachment 21922

Thanks Chris, I have found a nice tach but it is for (12 pole outboards only )and I was trying to find out if this will work so by what your saying I have a 6pole unit and a 12 pole tach will not work? I have the harness that plugs into my control box, an original Evinrude unit. The tach that was on it was junk so I'm tring to replace it with a new one from the 70's era to go with the boat I'm restoring.