Several items: The system is not keeping up with the load of the plow draw. If the new batteries can be charged using a charger to 12.6 and then they work well to start the truck they may be OK. New batteries can be bad. Is the cranking amps of the new bats the same or larger than the original? If they are appropriate, the charging system may be at fault. The battery voltage should be 14.2 to 14.6 volts with nothing turned on but the engine. The voltage may be 13.5 or so just after the startup. and get to 14.2 within 5 minutes. Is the drive belt tensioned correctly? Is the belt worn and bottoming in the multi grooves? Is there a voltage drain in the circuit when the truck is off? Is the electric motor on the plow hydraulic system drawing more than allowed. I also believe an amp meter that is hand held and pressed against the wire, (cheap) will allow a clear measure of alternator utput in real amps. Jim
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Today's Featured Article - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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