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check voltage at with tradtor running pull off pos side of battery see if your getting voltage for 6 volt 6.5 to 7.5 volts for 12 volts 12.5 to 13.5 if low voltage go to voltage regultor if volt or low go to generator test there if low replace gen if voltage ok generator replace voltage regulator
Pull off the neg and use jumper cables connected to another vehicles battery. Attach the jumper normally on the other vehicle, attach the Pos to your battery pos and then attach the neg jumper cable to the disconnected neg cable on your truck. My suspicion is that your battery may test well with a volt meter but cannot take any load on it. It should be floating at 13.5 to 13.8, not 12vdc.
When you go pos to neg from one battery to the next it increases voltage, pos to pos just increases amperage. You would want to wire 2 in series, just imagine stacking batteries in a flash light, pos from one to neg on next. Remaining pos and neg are 12v now. Run both remaining pos to starter and ground both negs. your pushing a lot of amps with the batteries and doing 12v, and your charging system is 12v. If you do another series from there, you have to regulate the voltage when the starter kicks in...you risk burning every light and electric component...just like running 12v in 6v system... You can also use 4 12v batteries and run all pos to pos and all neg to neg and have mega cranking amps...that is how all modern big trucks are set up. Your pushing around 7k cranking amps that way(1500 per battery)...plenty to start the healthiest cat... And don't have the worry of dual voltages or running in series. You really don't need 24v to start and unless you have a 24v alternator, these are your 2 options. Best bet if your not sure is to try with 12v...no risk of frying anything even on 24v system. 24v on 12v system is, on the other hand, a big risk.
All vehicles with a 12 Volt Positive system are jump started in the same manner.
If done properly, you should always connect the +Pos side on the battery in the vehicle that should be running, then connect that same cable to the +Pos side on the low battery. Then, you connect the -Neg side on the running vehicle, and now connect the other -Neg end to a solid ground on the vehicle with the low battery. You really want a good connection for this on a solid part of the engine/trans., since when you attempt to start the car, it will be drawing 400-700 Amps. (Alternator bracket, exhaust manifold, a sling point, etc. wil do.)
Some people hook to the -Neg side of the low battery, but that can cause sparks as well as an explosion if hydrocarbons are coming out of the low battery.
A completely fried battery can cause the vehicle providing the jump start to stall and can even damage components if not connected properly.
FIRST CHECK TO SEE IF YOUR BATTERY CAN ATTAIN & SUSTAIN A FULL CHARGE FOR 24 HRS, IF NOT REPLACE BATTERY. IF OK, DISCONNECT POS TERMINAL, HOOK UP VOLT METER SEE IF YOU HAVE MORE THAN 8 VOLT DRAW IN THE SYSTEM, IF SO START PULLING FUSES TO LOCATE EXSESSIVE DRAW ON BATTERY.
start the vehicle up and unhook the pos cable from the battery if it dies its going to be a bad alternator or the battery has gone bad.one sure way to know if its the alternator is to un hook the pos cable while the car is running.they can test good even when they arent.
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