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Tractor Talk Discussion Forum

Ford 4630 electrical system

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Ol Chief

09-01-2003 12:17:54




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I just replaced the start solenoid which was grounded.Also then discovered that the circuit tied to the thin lightweight ring terminal,has a dead short.This ring terminal is attached to the hot post on the solenoid.Two light wires are crimped on that ring.At least one of those or both are shorted.There is no power thru the start switch to operate the solenoid relay.I can assume that one of the wires mentioned is the feeder to the start switch.However The ring terminal remains disconnected due to short. With ignition switch on, the dash indicator lights function.When that switch is turned to the start mode, indicators go out and there is no power to fire the relay.Can any one identify the wires in question?I have no diagram of system.Is it possible that one wire is from the altenator.If so I must be in trouble because this Lucas alternator is fitted w/four wires plus a ground.Also English electrical symbols seem to differ from American ones.I can jump the to the relay to start engine but if I do so and operate the the tractor is there any problem for the alternator.

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Rod F.

09-01-2003 19:52:53




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 Re: Ford 4630 electrical system in reply to Ol Chief, 09-01-2003 12:17:54  
Without checking the diagram, I would guess that one of those wires goes to the fuse panel. There is a few relays in there that need power, and probably a bus for some stuff. It would also do well to check the ground terminal on the starter, to see if the post is actually loose. Tighten the jam nut behind the cable if it's loose. If there is a dead short, check the wires, starting at the starter relay. The ignition itself could be getting bad. It the starter relay has an open, it will run from the ignition switch, then (I think) to the transmission neutral switch, then to a micro switch on the PTO lever, then to the starter. I don't think it's fused. Think the ignition switch is fused. If there is power to the instrument cluster, then the alt will be getting exciter current, and is working, provided the light is out. I can look up the schematics if necessary, but sounds like you will have to chase some wires anyway. Also help to know if this is a cab model or not, if you want me to look. Good luck.

Rod

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Ol Chief

09-02-2003 19:24:54




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 Re: Re: Ford 4630 electrical system in reply to Rod F., 09-01-2003 19:52:53  
Rod thanks for the reply.I had checked the ground post,replaced the solenoid,checked the starter and looked into the fuse panel.Panel interior is suspect,but I did not have time to open out.Did not have a butt splice so did not cut the wires in question to wring out which line is shorted.These conductors appear to be # 14 or smaller so I had ruled out panel feeder.However I wonder if one is feeding the start side of the ignition switch separately because I have no start circuit with that ring terminal disconnected.I will be looking at the switch first before cutting wires.Then the back side of the panel. My primary concern was the generator protection.I have no idea how that circuit is wired and I do not want to purchase a new Lucas alternator.As you pointed out it is probably ok if the ind. lites go out. I had a mental block on this problem because I have just too many other things up in the air with little time to sort out the problem.

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Rod F.

09-03-2003 20:06:42




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 Re: Re: Re: Ford 4630 electrical system in reply to Ol Chief, 09-02-2003 19:24:54  
Those ignition switches have one in-feed, the rest are out. Fairly easy to beep them with a multi meter to check the operation. I find that they often die while cranking. The engine starts, and the starter keeps going.Whirrrr! The meter is great for chasing down shorts too. Good luck.

Rod



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Ol Chief

09-04-2003 21:41:04




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 Re: Re: Re: Re: Ford 4630 electrical system in reply to Rod F., 09-03-2003 20:06:42  
Hi Rod;I got back to the problem today.Was checking to see if charging lite goes out with the engine running.It stayed lit.Stopped the engine and started looking.Noticed one of the wires in questionseemed rather brittle from heat.Then I went to the generator and found a similar size wire to ground post also same condition.Then disconnected the wire from post.This cleared the short to the starter lead.I have total continuity, so now I suspect a problem in the harness or at some other junction where these wires come.Since I do not know where The alternator ground is supposed to go I will have to open the harness and try to trace.This tractor has no cab. Also has no color code.In addition The output wire on alt.post is only 800 ohms to ground.Any idea whatit should be. Iwould guess at least One megohm.Iwill keep you posted.

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Rod F.

09-10-2003 21:05:10




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 Re: Re: Re: Re: Re: Ford 4630 electrical system in reply to Ol Chief, 09-04-2003 21:41:04  
Sorry for taking so long getting back. There is a temperature sensor in the battery tray that will cut field current if the battery starts to boil. That will have some resistance, but not sure how much. Otherwise, the only resistance should be in the indicator circuit. Other wire goes to battery, and there is probably a radio interference device, which will go to ground. I would not expect much resistance, other than the battery temp sensor.

Rod

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