massey fergeson135 tractor battery going dead?

Question

the battery keeps going dead unless you unplug the wiring harness we have done and checked the alternator and the is not the problem could it possible be in the wiring

Answer 1

If, as you say, your battery stays charged by disconnecting the wires leading to it, then the battery is likely ok and something else is pulling it down to the state of discharge.

Alternators create alternating current and have diodes in them to create a full-wave rectifier that will change the AC current to the DC current needed by the tractor's electrical system. Sometimes, a bad diode can cause the problem you describe but more often than not, the problem lies elsewhere.

You say that you checked the alternator. I hope that means that you pulled the alternator off and had it checked by a rebuilder because they have the test bench to check all aspects of alternators. You want to be 100% sure that the alternator is not at fault prior to spending a lot of time tracing the individual wires in the harness.

If the wiring harness has plastic multi-conductor plugs and sockets in it, then I would check them to see if there is any corrosion that might be causing electrical leakage from one terminal to another. Any sort of bare wire in the actual harness that was touching ground would also be a dead short that should blow a fuse or cause the wire itself to melt. Nonetheless, you need to check all the spots that the harness touchs metal because vibration of the tractor can cause the insulation to become damaged.

These sorts of problems are hard to find. As suggested, it could be a faulty key switch that is allowing a tiny bit of current to leak to the lighting circuit or to the injector cut-off solenoid. You have to isolate each device that receives current from the keyswitch or lighting switch/es and then test for current draw one by one. This is best done with an analog DC ammeter that has a scale which reads less than one amp draw to 30 amps. Digital meters often give false readings.
Good luck.

Answer 2

It almost sounds like you have a wire grounding somewhere. Do you ever get shocked when you touch the tractor?

Like one person said you might want to also check the solenoid. You might also want to check that nothing remains on after you turn the tractor off. Even the smallest light being left on for several hours can make a battery go dead.

Lastly check the battery and battery fluid. If it is over 3-4 years old, you might want to see about getting a new one, especially if it was a cheap battery.

Answer 3

Sometimes a battery cell will short out or go dead. Best thing to do is take the battery out, check the voltage with a multimeter, charge it, check the voltage again. If it indicates full charge, let the battery sit for 24 hours and check the voltage again. If it has dropped, get a new battery.
If the battery is holding the charge ok, then you likely have either a short in the wiring somewhere or a faulty voltage regulator.

Answer 4

each and every so often those have a oil rigidity sensing change it relatively is declared to an hour meter that would desire to be the subject. The sensor might nicely be constantly powered and if it is going undesirable it is going to act such as you're describing. it relatively is placed on the engine with 2 wires to it. attempt taking a attempt mild and notice in case you may decide what continues to be powered once you have the main off. As yet another submit suggested it might desire to be the battery. once you shut it off attempt disconnecting the floor cord from the battery and letting it take a seat overnite and notice if it is going to initiate day after immediately. If it does then the battery is okay. in this mower the starter acts as a generator so look over the wires to work out if there is any obtrusive shorted wires. desire this permits.

Answer 5

Disconnect the positive terminal. With the key off tap it against the battery terminal. If you see a spark you have a draw somewhere. A bad or out of adjustment voltage regulator would cause this or a bad altinator.

Answer 6

Theres something still drawing off the battery when its shut off. Id get a volt meter and see where theres a draw with it shut off. More then likely the ignition switch might need replacing ( has a constant 12 volts to it ) .
Kidd

Answer 7

there is a voltage regulator that looks like an old ford style, but the pins are not the same.. I bought one, standard still makes them, but u m ay have to order it..good luck

Answer 8

maybe the wiring....but check the starter or solenoid....