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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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