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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: May 2015 Posts: 11,023 Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums | | Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums Joined: May 2015 Posts: 11,023 | The maintainer shoudn't work like an inverter if you leave it connected to the battery. I think something is wrong with your battery maintainer for it to discharge the battery (I'm assuming thru the block heater). I've use the same arrangement without any issues. You might want to check if there's voltage on the power plug of the maintainer with it connected to the battery. There shouldn't be any at all.
As long as the battery charger and block heater don't draw more current than the extension cord is rated for, it would be fine.
A block heater at 1000W would draw about 8 amps. It would take a pretty big battery charger to draw even that much and overload the extension cord.
Kevin 1951 Chevy 3100 work truckFollow this saga in Project JournalPhotos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together. | | |
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