Find the + post on either battery. Connect the charger's + clamp to it. Connect the charger's - clamp onto the chassis somewhere away from the battery. The batteries maybe ok. The cable crimp into the battery clamp and the - cable to chassis connection often looks good but has high resistance. Only way to really know what is going on is to measure voltage while cranking at each battery, post to post. Then measure the voltage from the starter's input post to the starter's cast body. Thing is I've never had anybody in 6 years of asking that question come back with voltage answers. Everybody just throws parts at it hoping to hit the problem. It’s very common to find a system with two 12’s in parallel. And find that either one battery is a dud and doing nothing. Or one battery connection is corroded. In either case one battery is trying to start the engine alone. As previously stated. The batteries have to be a matched pair or the results are fair at best.
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Today's Featured Article - A Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
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