Tachometer: # of Alt. Poles

[DJ]

1975-50 HP Johnson (2-Cyl.) Mod. # ESL75B

All,

I'm installing a Teleflex tach. for my 1975 50 HP Johnson.

The instructions are a bit to be desired, so I went to the Teleflex site for some info.

There it gets confusing.

The chart says:

1971-77 40-60 HP (2-cyl.) Set tach to "6P".

1971-77 50-55 HP (2-cyl.) Set tach to "5P".

So the real question is, does my 1975 50 HP have a 10 or 12 pole alternator?

My interpretation would be that it is a 10 pole?

 

[Joe Reeves]

Re: Tachometer: # of Alt. Poles

The OMC engine alternators emit six (6) pulses. The tachometers operate off of this six pulse emmision. Set the tachometer to 6P (Six Pulses).

 

[DJ]

Re: Tachometer: # of Alt. Poles

Thanks Joe.

I'd never heard of ten pole before but the instructions made the 10 pole look compelling.

Thanks for setting me straight.