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?? on B JD

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B JDfarmer

02-11-2004 18:18:37




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I have a styled '46 B JD and the wiring is all hooked up and when u hook it up to the battery it sparks like something is draining the battery and the lights are off and everything. What could be the problem? Thanx




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John T

02-11-2004 19:46:33




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 Re: ?? on B JD in reply to B JDfarmer, 02-11-2004 18:18:37  
Farmer, Sorry, but I gotta ask a few questions which will enable me to better help you, then I will help you troubleshoot it.

When you say everything is all hooked up, have there been any changes made lately?? If so what were they??? Was a new battery or Generator or Voltge Regulator installed?? If a new battery was installed, was it installed the same polarity as the old??? The original was positive grounded.

Is it a coil or mag ignition??? If a coil ignition, are you sure theres no ignition switch not turning off??? or stuck or mis wired???

*****************PRELIMINARY ***************** Some of this dont matter, but its still good info and things to check up on.

Does it have a working ammeter and if you turn the lights on does it swing to discharge???

Does the ammeter show some discharge when you hook everythig up as you described yet no lights or ignition is on????

Have you polarized the Generator since all was hooked up??? If it has a 3 or 4 wire Voltage Regulator, polarize as follows:

Temporarily jump connect the Field post on the Generator (smaller of the 2) to its steel case ground. Then momentarily flash jump a wire FROM the BAT terminal on the VR over TO its ARM (or GEN) terminal and you should get a small spark, then remove both the temporary jumpers.

If it happens to have a 2 wire cutout relay instead of a 3 or 4 wire Voltage Regulator, again temporarily ground the Field post as above, then momentarily flash jump a wire around the cut out relay (may be labeled its BAT and GEN terminals) or the same thing happens if you momentarily flash jump a wire from the BAT terminal on the cut ut relay to the ARM post on the Generator (same point as GEN or ARM on the relay)

*************TROUBLESHOOTING*******************

Once all is hooked up but if she still sparks when the battery is connected and you have polarized and checked the battery ground, proceed as follows: ALSO BE SURE THE SMALL WIRE (NOT the battery cable) UP FROM THE STARTER POST TO THE AMMETERS BATTEYR SIDE ISNT SHORTED OR PINCHED, Ive seen that happen !!!!! !!!!! !

1) Remove the lead on the BAT terminal on the VR (dont let it short out, its hot) and then see if the battery is still discharging or sparking when re hooked????? ?? If so, the cutout relay in the VR may be stuck closed, its supposed to close so the gens output can get to and charge the battery, but open when tractors off so the battery dont reverse discharge thru the generator. If that relay in the VR is stuck and the tractors off and the batterys hooked up, it discharges fairly heavy and will drain the battery shortly. If the belt were loosened, it may even make the generator spin. If tapped on and it unsticks, its going bad and may stick again.

2) If shes still discharging/sparking EVEN WITH THE BAT LEAD OFF THE VR, there may be a short in the wiring or the light switch or ammeter or several other possible places.

3) The ammeters load (not to battery) side should have a couple wires or so on it (depends on switch and type of ignition). One to the light or ignition or both switches and another down to the BAT termial on the VR. The ammeters battery side terminal should have only 1 wire to the starter or ungrounded battery post, thats the main hot feed. UNHOOK THE WIRES OFF THE AMMETERS LOAD SIDE 1 at a time to see which circuit (lights or ignition or down to BAT on VR) is causing the battery discharge. It could be the lights or light switch or wiring to them or down to the VR's BAT terminal. Find out which is the drain. Finally, unhook ALL leads off the ammeters load side and see if she still discharges???

4) If theres no shorts in the wires or switches,,,,, , the cut out relay in the VR isnt stuck closed,,,,, ,,,unhooking ALL leads off the ammeters load side STILL DOTN STOP THE DISCHARGE,,,,, ,,there may be a short in the big battery cable that goes down to the starter post. It can get against the brakes or flywheel and cut into the insulation causing a short. INSPECT IT THOROUGHLLY.

5) There could be a short in the starter switch itself, AND ANOTHER GOOD PLACE FOR A SHORT is in the lil (NOT battery cable) wire up from the starter to the battery side of the ammeter CHECK THAT !!!!! !!!!! !!

6) If its a coil ignition, make sure theres an ign switch that works and is turnign off voltage to the coil when OFF ?????

If she wired right and correct grounds and polarized and is discharging, theres a short somewhere, either via a stuck relay or bad switches or wiring (which unhookign things 1 at a time off the VR and ammeters load side terminal should find) or a shorted cable and finally possibly a shorted starter switch.

Post back or e mail me at [email protected] any questions or call me at 812-824-4608 and I will try my best to help you.

Let me know, check the simple things first like shorted or pinched wires or a shorted battery cable or a stuck cut out relay, then proceed to disconnectign loads off the ammeter 1 at a time until you find the short like the light switch or ignition or ign switch or wiring.

God Bless

John T

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Clooney

02-11-2004 18:58:34




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 Re: ?? on B JD in reply to B JDfarmer, 02-11-2004 18:18:37  
B JDfarmer, you could have anything from a shorted battery cable, to a stuck cut-out relay, to a shorted wire to the ammeter, to a sticking starter solenoid, to ??..

~Make sure you are installing the battery at the correct polarity... That "B" is positive ground [positive battery post to ground].. If you are installing it backwards & the battery is fully charged it could be energizing the cut-out relay..

~After the battery is installed only hook up the ground cable, don't hook the cable up between the starter & battery... Then hook a 6 volt test light or any 6 volt light [you might get by with a 12 volt test light but it will only glow ] between the battery post & the unconnected battery cable.. If the light comes on you have short to ground somewhere... Move the battery cable & look closely for the battery cable to be shorted to ground.. If nothing found there remove the [BAT] terminal wire on the cut-out relay on the generator.. If still nothing found disconnect the starter solenoid..

~When your short is found that light you inserted between the battery post & the battery cable will go out...

~If you can find & repair the short you will be good to go.. If you can figure out what part is causing the short post back & tell us & we can probably tell you how to repair it..

Give me an E-Mail & I can send you a wire diagram for your "B" but that "B" has such a simple wire harness the wire diagram probably won't help much in finding your problem...

[email protected]

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