Finally getting rid of the dreaded Onan MDJE 7.5. It did not have an alternator
or separate starting battery. it used one of the main engine's starting battery for starting the generator. Do I need a separate battery for the generator? If not, do I wire the generator's alternator to the main engine starting battery?
Thanks in advance for any help,
Chris Puryear
1978 37C
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Thread: new generator install question
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01-19-2018 12:54 PM #1Registered Member
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new generator install question
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01-19-2018 03:30 PM #2Senior Member
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- Apr 2005
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Re: new generator install question
I replaced my MDJE about 6 years ago with a 9kw Norpro. I wired it up the way the Onan was - using the main starting batteries for starting the genny. Its never been a problem for me, but I think it would be better to have its own battery, for the rare event that your main batteries went dead. Best way would probably be to use a battery selector switch so you could use either the mains or the genny battery.
Everyone should believe in something - I believe I will go fishing - Henry David Thoreau
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Re: new generator install question
That's what I did. I added a dedicated genset start battery which is charged by the genset only. I added a 1/2/All battery switch so that I could start the gen off the stbd main battery if the gen battery died. The new genset battery is tiny - like the size from a lawn tractor. It was easy to find a spot for it. I just finished my 4th season with the new genset (It's a Beta Marine) and so far she has never failed to start.
Eric
41TC 1966 Hull #53 "Requisite"
Kent Island, MD/Ft. Lauderdale, FL
"Though she creaks - She holds"