Mando alternator replacement for a Searay

[Floatation Device]

I bought a back up 10 SI 3 wire delco alternator several years ago as a back up the my mando altenators. This weekend I had to replace one of the mando's. When searching the web looking for an alternator years ago for the back up, various sites said the 10 SI is a sub for the mando. So the mando has four wires, The 12 volt out, the field, an output for dash gauges, and an output for the electric choke on the carb.

The 10 SI has a 12 volt out, a field, and an idiot light out. Alternator put out 14.5 volts. With the engine off, the alternator got and stayed warm. Checked wiring and ensured the filed was connected correctly.

Ended up removing and ordering a new mando. Does anyone know any different about sub'ing a delco 10 SI for a mando on a Searay with electric choke and dash gauge hook up.

 

[Bt Doctur]

Marine alt do not have the idiot light function in a boat. http://www.ebasicpower.com/charge/alternatorwiring.htm

 

[Floatation Device]

All the research I did on the net, I could not find anything like this site. Thanks. The Delco I have is a 3 wire. I need to recheck the connections. On the mando, the terminal opposite side the E ground below the indicator light terminal that is not marked on the site you shared is connected to the electric choke on the carb. Not sure how this is connected to the Delco 3 wire Alternator.

 

[Bt Doctur]

The GM uses a Output (orange) ,a sense lead and an excite lead. sense is always seeing the battery, excite is fed off the ign side to turn the alt on.
http://www.boatfix.com/merc/Servmanl/13/13C4R2.PDF

 

[Bt Doctur]