12 volt-6 volt issue

Friend has his GFather"s 8N. Been talking to him by phone on distrib. shorting issues. Got that solved. Was shorting at the normal spot(concave screw) Anyway I know and he knows he needs a battery but in the meantime what am I forgetting? What if I loan him a 12v to 6 v resistor and let him use a 12 volt he already has..I know his 6 volt generator win"t charge the 12 volt battery but I"m not concerned about that since this is just for "getting it running" purposes and I know a 12 volt battery will run an N a long time, as in days.Been a while since I rewired mine from nothing to 12 volts....Any advice? Thanks

Tom.......use the 12-volt battery to jump the starter motor terminal ONLY. Usually, theres still enuff power in the "dead" 6-volt battery to run the ignition for a little while ......Dell

A 6v generator can explode a 12v battery.The higher field voltage can make the generator put out 60 amps at low speed.This happened on a 55 chevy.Someone put a 6v generator on the chevy.It blew up 2 12v batteries.

Thanks-I did talk to him again last night and he indicated that his bad battery would and has let him run it for a few minutes at the time. He"s having spark, no spark issues, spark on one plug then no spark etc..He knows his battery is bad so just trying to eliminate the old battery..He was charging another one last night and if it don"t charge he is getting a new one.Thanks again.

Thanks, would have never thought that could/would happen.

8n is a-circuit.

at startup, cutout is open

I don't forsee that cutout closing as the geny is not going to be able to produce more volts than the battery nominal coltage to close that cutout.. since an A circuit gets field current from the armature and not the battery.. I don't see an issue here.

my jd b had a 12v battery when i got it.. been that way for years.. I dropepd in a 6v and away she went.. charging like normal..

IMHo.. I would polarize the gen if the battery polarity is swwapped.. or to be safe.. just put the 12v battery in same polarity as the old 6v battery.

soundguy

IMHo.. I would polarize the gen if the battery polarity is swwapped.. or to be safe.. just put the 12v battery in same polarity as the old 6v battery.

soundguy

Sounder,

The cutout WILL close if the generator is functioning and puts out the 7.4 Volts (or thereabouts) to ground that is the setpoint of the cutout. Cutout closing is determined by the required Volts-to-ground without regard for there being a 12 Volt battery on the other side of the cutout.

Once the cutout closes and 12 Volts is fed to it's shunt coil (on the "GEN" side of the cutout), it likely won't open again and something is gonna SMOKE!

Or, reverse current through it's series coil will counteract the forward current though it's shunt coil and the contacts will chatter 'til they're gone. Either scenario won't be good!

strangely enough i've seen em last.. half my tractors came as 12v converts by the way of a battery and oe genny charge system.. none of them needed a vreg replacement.. though.. I bet if I looekd a the points.. the chattering as you say did likely deplete some metal.

a quick disconnect on the vreg would sole the OP's problems..er.. or at least work around them.

I may just have good luck with regulators.. I even reworked an old lucas one from my 5000 and 3000.. both had some really nasty points.. but function when bench tested.. I bet some of these new overseas one would likely smoke as you say though.

soundguy

The chevy didnt have an ammeter so I wired one in.It was a 60 amp and went full scale.A look at the generator tag number told me it was a 6 volt.The 12v generators were marked 12V and had a red tag.I think my brother in law put the 6v generator on the chevy.I got a 12v generator from the junk yard and no more blown batteries.Since Ford tractors used both A and B systems of field regulation you could get a runaway charging system.

(quoted from post at 15:55:07 09/24/09) strangely enough i've seen em last.. half my tractors came as 12v converts by the way of a battery and oe genny charge system.. none of them needed a vreg replacement.. though.. I bet if I looekd a the points.. the chattering as you say did likely deplete some metal.

a quick disconnect on the vreg would sole the OP's problems..er.. or at least work around them.

I may just have good luck with regulators.. I even reworked an old lucas one from my 5000 and 3000.. both had some really nasty points.. but function when bench tested.. I bet some of these new overseas one would likely smoke as you say though.

soundguy

Click to expand...

You say you got lucky on the VR, with no replacement necessary......what about the generator on those ?

I've yet to have a genny that could not be rebuilt.. and as of that.. have only had 2 rebuilt.. lucas jobs. Have rebuilt 2 ford ones myself.. an 8n a circuit, and a 00 series b circuit.. just brushes.. etc. ( not to say that I won't ever find one needing replacement. I fully considder it luck. I have even had good luck with rags as I said.... My naa had an old b circuit reg still wired up on it I had removed it and tossed it into my junk bin.. I tested it the toher day and it still works.. even though covered in rust externally... go figure. Much the same on my IH cub reg.. that incedentally was wired up totally wrong byt he prev owners.. had all 3 wires wrong.. I'm amazed it didn't let the smoke out.. )

ironically.. the one onthe 12v the longest was a jd 8a genny.. never touched it.. just pulle dthe 12v battery out, slapped a 6v in and noticed the ammeter jiggled toward charge the next time I started it up.. I had already priced a new reg and genny figuring they were a lost cause.. but they still work fine... course a 8a genny is a pretty wimpy thing.. but.. she's on a magneto, and the manual specs show 8a is rated charge.. so she's at full potential..e tc.

soudnguy