Old outboard question

[dieselhp]

I have a 1988 200 Yamaha outboard and seems charge only at 12 volts when at idle. If I rev it up it says the same. But if I drive the boat it goes up to around 14 volts. Does anyone no if this is normal for a stater engine of that age? My other boat has an alternator and it goes right to 14 volts when I start it. I think I remember other older engines I had did the same thing, but I’m not sure.

Thanks for the help.

Rick

[ray koziatek]

if it has a resistor type regulator it takes a few minutes for the resistor to get warm and put out the right amount of voltage..

[dieselhp]

I can let it idle for 15 min with no change. I get up on plain then it works it's way up to 14, but takes a min or 2 to get there.

[dieselhp]

I can let it idle for 15 min with no change. I get up on plain then it works it's way up to 14, but takes a min or 2 to get there.

[L&M]

if it has a resistor type regulator it takes a few minutes for the resistor to get warm and put out the right amount of voltage..

A what???

[L&M]

Rick that's normal for the year. It's a typical early style o/b charging system. Stator has a separate low voltage charge coil built in that runs to a rectifier that changes a/c voltage to d/c. The higher the rpm's the more d/c voltage increases to the battery. Charge coil in the stator only put's out a limited voltage at higher rpm's. Hence no per say voltage regulator only a diode style rectifier (not a resistor) to convert a/c to d/c as well as blocking reverse flow from battery when engine is not running.

[dieselhp]

Thanks Hank!

[ray koziatek]

http://www.freepatentsonline.com/3659188.html sorta like one of these