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TOPIC: Generator output

Generator output 1 month 6 days ago #130398

  • 63 Sabre
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How can I measure the output of the generator on the '65 60hp 'rude? Can I put a volt meter from blue or yellow wire to ground while the motor is running? Not getting any reading on the dash amp meter and the batt isn't charging.
This schematic is for a 40hp but the charging wires are the same.
I really think I'm going to completely build a new box for the entire mess. There is just not enough room in that little box for fuses, volt regulator, solenoid, connector plug and wires. What a mess.
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Re:Generator output 2 weeks 1 day ago #130821

I found it, thanks. On your question, a volt meter capable of measuring amps will have a built-in shunt which will measure the voltage drop when current is passing through it. So, plug the + lead on the voltmeter into the amp socket on the voltmeter and connect the voltmeter inline (series) with the battery, the battery cable on the + meter wire and the neg meter wire on the + battery post, and you should have a reading.(the current is flowing through the voltmeter) However if the output is greater than the rating of the voltmeter (usually "10A max") you'll probably get a max reading on the voltmeter. But you'll know that there is current present. Call me if you want to ask about it. 414-465-3381.

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Re:Generator output 2 weeks 1 day ago #130831

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Thanks! I'll try that, have to get the garbage can out and start her up again.

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Re:Generator output 2 weeks 1 day ago #130832

I think youll have to start up first then insert the voltmeter in series. hopefully the open circuit doesnt shut down the engine. otherwise insert the voltmeter(ampmeter) inline with the generator to the voltage regulator. dont try to start the engine with the voltmeter already inplace, it would probably be too many amps for the meter, dont want to damage it...

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Re:Generator output 2 weeks 23 hours ago #130835

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I can pick up a case of $2 meters at Harbor Freight :laugh:

If I just put my volt meter on the battery while the motor is running I should get a reading also? Probably around 13 or 14 volts?. If I put the amp meter in place of the 20 amp fuse in the circuit that should get a reading right??
This pic was taken before the regulator was installed.
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Re:Generator output 2 weeks 19 hours ago #130838

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63 Sabre wrote:

I can pick up a case of $2 meters at Harbor Freight :laugh:

If I just put my volt meter on the battery while the motor is running I should get a reading also? Probably around 13 or 14 volts?. If I put the amp meter in place of the 20 amp fuse in the circuit that should get a reading right??
This pic was taken before the regulator was installed.


You should be able to check output right at the battery with the engine running.. If the regulator you installed is from an automotive application, it will probably be set at a max of 13.8 volts.. Most "marine" regulators are set to a higher voltage between 14.2 to 14.5 volts because it's assumed that it will be charging multiple batteries at the same time..

I'm assuming that you realize that most of the older outboard charging systems had little to no output at idle speed, their max output was usually somewhere around normal cruising speed (3000-3500 RPM)..With the engine running, connect your voltmeter across the battery terminals and check the voltage.. Then rev the engine to around 2000-2500 RPM while watching the voltmeter, the battery voltage should climb to whatever the regulator's set point is..

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CC-John

1973 Century Resorter 16, 225HP Chrysler LM318

1978 Chris Craft 251 Catalina Express, 330HP Pleasurecraft 350 (383 Stroker)

Re:Generator output 2 weeks 19 hours ago #130839

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Sounds like a plan. If it gets above freezing this week I'll giv it a try.
Not too many of these old girls came with a generator. I think it was an option.
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Re:Generator output 4 days 21 hours ago #130938

Hey Cal! Did you test the generator yet? I found this test procedure, a little different than the messing around I was proposing...
www.scribd.com/document/325324641/1968-Evinrude-40HP-Big-Twin-Service-Manual-pdf

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Re:Generator output 4 days 21 hours ago #130939

Also, now that I have mine home, I "just" noticed the generator on mine has been "forcibly" removed. The ring portion of the bracket where the generator actually mounts has been broken off! Unless that structure interferes with removing the cover and a PO wanted it out of the way, I would assume someone just busted it off to take it. I did find the drive belt under the back seat... I see a couple on e-bay, would the motor thread guys have parts available?

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Re:Generator output 4 days 16 hours ago #130943

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Haven't had a chance to run it yet but I did install a voltage meter. Thanks for the link it will be helpful.
The generator mount is probably around somewhere on ebay or if not marineengine.com. Guys might have parts available wouldn't hurt to ask.

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Re:Generator output 4 days 16 hours ago #130945

you could put the voltmeter(ampmeter after you change the wire position) between the 2 wires on the dash ampmeter. The dash meter could be bad..

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Re:Generator output 4 days 16 hours ago #130946

ALSO CHECK THE CONTINUITY OF ALL THE WIRES the ones for the dash meter and from the generator, only takes one bad connection . . . and of course the generator/regulator only allows current at higher engine rpm's...

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