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In article ,
says...
I have a 76 115hp Johnson OB. Last weekend my tach melted down, not
sure why, but i have to give it credit for lasting thirty seven years.
I found a new Teleflex tach on ebay that said it was compatible with
outboards (with alternators). My dead tach has only two wires. One is
grounded inside the control unit. The other enters a wiring harness,
leads back to the motor and I really can't tell where it goes from
there. I checked it for voltage and it has none with the motor
stopped, key on. My question is, if i hook up 12v and a ground to my
new tach, is that grey wire what i want to use for a signal? I believe
the tach reads alternator pulse. If that's so, wouldn't any hot wire
provide a signal? How does all this nonsense work?
--
roadhouse1301
Yes, the grey wire is from the alternator, is what is used by the tach,
does read the pulse, and, since it is reacting to transitions, as I
understand it this is essentially an AC voltage since it is before the
rectifier, from the alternator to derive the RPM a steady DC voltage
isn't going to make it do anything.
--
Mike G.
Heirloom Woods
www.heirloom-woods.net
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