alternator replacement, 3-wire to 1-wire

[fsjcowboy]

This question regards a 1987 Four Winns with a 4.3 OMC, Cobra outdrive.....The original alternator has locked up and needs replacement or rebuilding. Can a newer one-wire, marine-grade alternator be used as a replacement? I know the orange wire would get connected to the alternator, but where would the 2 unused purple wires get terminated? One of these wires is the resistor wire.

 

[rodbolt]

Re: alternator replacement, 3-wire to 1-wire

will work fine,simply cap off the unused terminal rings with heat shrink and wire tie out of the way.
orange is alt power out,red is battery sense and purple was altenator exite.
the one wire style is self exciting with an internal regulator.

 

[fsjcowboy]

Re: alternator replacement, 3-wire to 1-wire

Thanks Rodbolt. Can't get much simpler than that.

 

[fsjcowboy]

Re: alternator replacement, 3-wire to 1-wire

If I install a 1-wire alternator, do I need to change the "external resistor" coil also?

 

[zbnutcase]

Re: alternator replacement, 3-wire to 1-wire

No. 'nutcase

 

[fsjcowboy]

Re: alternator replacement, 3-wire to 1-wire

The alternator replacement worked great and easy, without a hitch. Tks again.