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Coil + to distributor wire melted.........?

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Nathan

08-14-2002 18:55:00

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620 all fuel positive ground system. 1 12volt battery. It's been dropping to 1 cylinder after about an hour of heavy bushhogging. Checked the valves clearance today, .020 warm. Then I noticed the wire from the + side of coil to distributor had the insulation melted off. Checked the running volts at coil, about 6-7 volts. 9-10 at resistor switch side with cheap meter. The right side quits firing. It has spark at the plug wire. New plugs(386) did the same thing as champions. any ideas? Anyone got a wiring diagram?

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08-15-2002 10:42:01

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Re: Coil + to distributor wire melted.........? in reply to Nathan, 08-14-2002 18:55:00

from the + side of the coil to the dist? I don't know JD's but all the ignition systems I've worked on (cars, boats, bikes) have the neg coil wire to the dist.

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Steve - IN

08-15-2002 11:09:21

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Re: Re: Coil + to distributor wire melted.........? in reply to lc, 08-15-2002 10:42:01

lc,

You owe it to yourself to experience the joy of working on an old Jaguar or MG or Healy or TR, or most any real Brit car (Brit Fords don't count)! Anything that says Lucas (Prince of Darkness) on the electrics will make you crazy. Popper JD's don't have Lucas, but like the Brit iron, they're positive ground. So that wire is backwards from your Chevy or Mopar, etc. In any event that one wire probably isn't smart enough to be so devious as to let one cylinder fire OK then a few frations of a second later make the other cylinder sputter. You have to get in to electronic controls to see those kinds of tricks. Most likely something in the secondary wiring if it's an ignition problem.

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Clooney

08-15-2002 03:51:12

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Re: Coil + to distributor wire melted.........? in reply to Nathan, 08-14-2002 18:55:00

Nathan, given the voltages you measured, that coil wire was either burned under different circumstances, by heat from the engine or ? If that coil to distributor wire burns it usually means the points get burned also due to an internal coil short or mis-wiring of the coil.
~As for the running problem, it could be anything from a tight valve to low compression to weak valve spring to carb problem to bad plug wire to ?
~Make sure you have good fuel flow to the carb, the points are opening the same for both cylinders, the cap isn't cracked or the plug wire isn't cracked or has high resistance. When the tractor starts acting up run a hot compression test & see if you get a blue spark that will jump a 1/4" gap..... ...

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Nathan

08-15-2002 07:13:07

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Re: Re: Coil + to distributor wire melted.........? in reply to Clooney, 08-15-2002 03:51:12

Thanks Clooney. I'll check those things next time. Probably this weekend, bahia grass is knee high!

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