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Electrical

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RickD
Posts: 3
Joined: Mon Jan 05, 2015 5:46 pm

Electrical

Post by RickD » Wed Sep 04, 2019 4:41 pm

I have a model M 1958 engine. At idle my generator shows 12 volts output but at higher RPMs the output drops to 7 volts or less. Is this a generator problem or a voltage regulator issue?

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mbigpops
Posts: 369
Joined: Tue Feb 16, 2010 9:18 am
Location: Eastern Massachusetts

Re: Electrical

Post by mbigpops » Wed Sep 04, 2019 7:01 pm

Hi Rick,

The generator is actually not generating at low RPM and does not kick in until higher RPMs when it supplies power to the electrical items and charges the battery.

It sounds to me like your generator is working fine. What is happening is your generator output is open at low RPM and then at higher RPM when it closes and connects to your loads then the voltage is getting dragged down. Something on the load side (switch, light, battery, etc. ) could be shorted internally or the wrong voltage (6V ?).

To test you can first remove all loads and then run it up to higher RPMs and see if the voltage stays at 12V. If good then add back in one load at a time and test until the voltage drops again.

Good luck.

Mark
1953 CC Rocket Runabout "Rocket Man"

Greg Wallace
Posts: 372
Joined: Wed Mar 08, 2006 2:49 pm
Location: Indian Lake, Ohio

Re: Electrical

Post by Greg Wallace » Thu Sep 05, 2019 8:04 am

Might you be reading amps rather than volts?
Greg Wallace 23 Custom 22166 former Chris-Craft dealer Russells Point, Oh.

jfrprops
Posts: 2056
Joined: Thu Dec 29, 2005 10:41 pm
Location: Powhatan Courthouse Virginia

Re: Electrical

Post by jfrprops » Thu Sep 05, 2019 12:11 pm

I am with Greg.
???
John in Va
1980 Fairchild Scout 30
19?? custom Argentine Runabout 16'
1954 Whirlwind deluxe dual ckpt 16'
1921 Old Town Charles River 17' (founding Captain, James River Batteau Festival)

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Bilge Rat
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Re: Electrical

Post by Bilge Rat » Thu Sep 05, 2019 2:04 pm

To read amps, the meter leads would have to be plugged into the amps jack on the meter and connected in series with the positive from the generator as it goes to the helm amperage meter. If the meter is set to amps, plugged into the amps jack on the meter and then the leads connected to positive and negative, either the meter's fuse will blow or you will fry the meter's amps range.

This is assuming you're using a meter lead set up and not a clamp on current meter.
1966 Lyman Cruisette 25 foot "Serenity Now!"
1953 Chris Craft Sportsman 22 foot "Summerwind"

Greg Wallace
Posts: 372
Joined: Wed Mar 08, 2006 2:49 pm
Location: Indian Lake, Ohio

Re: Electrical

Post by Greg Wallace » Fri Sep 06, 2019 6:58 am

I was thinking maybe he was reading the AMP meter on dash?
Greg Wallace 23 Custom 22166 former Chris-Craft dealer Russells Point, Oh.

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