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8n electrical question

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Aaron

02-11-2003 10:40:49

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We have an 8n that has fried to coils. when we got it there was a make shift on off switch that we took off cause it wasnt original. This leads me to ask how many volts are supposed to be sent to the coil? Is it possible that our resister could be bad? Thanks for taking a look

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Gary

02-11-2003 21:06:57

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Re: 8n electrical question in reply to Aaron, 02-11-2003 10:40:49

I havelearned to always replace the resistor when replacing the coil. It's inexpensive insurance. This goes way back to about 1946 when the old 36 Ford car let us doen for the 2nd time ob a country road after just replacing the coil. We replaced the resistor along with the coil next time. I have been talked out of replacing the resistor just a couple of times by customers and the local Ford dealer. It always returned to bite me. A coil should NEVER go bad if it gets the right juice. Electrical engineers call the ballast resistor a thermistor. It resists current flow according to the temperature of the resistor wire.

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Gary

02-11-2003 21:06:47

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Re: 8n electrical question in reply to Aaron, 02-11-2003 10:40:49

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soundguy

02-11-2003 11:02:20

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Re: 8n electrical question in reply to Aaron, 02-11-2003 10:40:49

Ok, here's a quickie rundown on 8n ignitions, as learned' to me by the fine members here, especially Dell.

N's have two basic types of ignition setups, front mount and side mound distribuitors.

You didn't specify, so I will assume yours is still 6v positive ground.

Ok, the front mount ignition coils are wanting more like 4.something volts... so ford uses the infamous ballast resistor. The other setup is the sidemount , and uses a 6v cannister style coil, no resistors.

Some causes for burning out coils are as follows:
12v conversion without addition of a sepperate dropping resistor ( either front or sidemount setup). No ballast resistor on a frontmount.
Possible some jurryrigged setup like 8volt system, etc.

If you are burning coils, let us know more details about your setup, like side or front, and voltage of electrical system, and presence of any resistors.

Soundguy

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aaron

02-11-2003 17:12:52

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Re: Re: 8n electrical question in reply to soundguy, 02-11-2003 11:02:20

We have a front mount 6v system. Is there any possibilities that the resistor may be out of it or something. We are going to check to see if we have too many volts headed to the coil. if you think anything else would be a help please add it.

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Mountainman

02-11-2003 18:06:34

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Re: Re: Re: 8n electrical question in reply to aaron, 02-11-2003 17:12:52

About 4 volts at top of coil, points closed.
Battery voltage at top of coil, points open.

Is there a resistor wired into the harness? It would be on the back side of the dash.

Check it out and post back here for more info.

hth

Mountainman...CA

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aaron

02-11-2003 19:41:19

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Re: Re: Re: Re: 8n electrical question in reply to Mountainman, 02-11-2003 18:06:34

Yes there is one wired up onto the back of the dash. I changed wiring around according to a diagram we have and are still not getting spark. anymore suggestions would be a help thanks

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Dave OH

02-11-2003 23:38:25

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Re: Re: Re: Re: Re: 8n electrical question in reply to aaron, 02-11-2003 19:41:19

As Mountainman said stretch the spring on the coil, it seems that everyone has had to do that.
Check for voltage across the resistor. They may have wired around it because it was bad.
Dave OH

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Mountainman

02-11-2003 23:01:04

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Re: Re: Re: Re: Re: 8n electrical question in reply to aaron, 02-11-2003 19:41:19

Sounds like you need an FO-4 manual - has a proper wiring diagram and lots of info about the tractor.

Did you measure the volts at the top of the coil?

If you got any reading close to my previous post, then the trouble is in the distributor, condenser, points, cap rotor, wires or plugs themselves. Or a defective coil or the little spring between coil and dist is not quite long enough.

But frying the coil sounds like someone wired around the resistor, a defective coil out of the box (happens) or maybe a bad condenser.

hth

Mountainman...CA

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