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Left the key on

C

Cooter143

Member
Hi folks, I used to be a regular visitor here but got busy with life and have somehow managed to keep all my tractors running with few problems. Until today. I brought my 48 8n front-mount up to the house from the farm and left the key on overnight. It was running great before but now wont start. A quick check showed no spark. What kind of damage did I likely do?
 
(quoted from post at 18:58:30 04/07/21) Hi folks, I used to be a regular visitor here but got busy with life and have somehow managed to keep all my tractors running with few problems. Until today. I brought my 48 8n front-mount up to the house from the farm and left the key on overnight. It was running great before but now wont start. A quick check showed no spark. What kind of damage did I likely do?
Click to expand...

Burnt points.

Worse, burnt points and coil.
 
(quoted from post at 04:09:10 04/08/21) Points and coil. My question would be, what were you doing that you left the key ON after the engine was shut off? Not critisizing. Not an exclusive club, BTDT. LOL
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John, I burned up an EI unit when my fire pager went off. Fortunately they pay well for the response.
 
I had it shut down on the trailer and decided to shift it back a little bit. It was flooded so I left it where it was, and I guess I left the key on too. Ive done that a few times on my other 8n but Ive gotten away with it until now.

Thanks everybody, is there a way to test the coil? I was going to change the points anyway.
 
I have left the ignition turned on a couple of times and it was the coil that burnt up.

Thought I had myself trained but obviously I am a slow learner.

Expensive lesson every time.

Peter
 

You can tell if it's bad with a multi-meter, check resistance primary and secondary. BUT, if it's resistance is OK, it could still be bad. That is you can tell if it is bad, sometimes.

I can't remember proper resistance for 6V coils? It written down with notes in my tool shed. Someone here will know

Don't buy a cheap Chi-Com coil, they are horrible. One I looked at at TSC, the top cover was not even on tight.
 
From the top of the coil to the pig tail should be around 1 ohm for a 6 volt and 2-3 ohms for a 12 volt. From the top of the coil to tab, cap contact, should be around 6K ohms.
 
I suspect there is a band of burglars around who do nothing but sneak in & turn keys on! Anyway I happened to notice the key on my '52 Major was on the other day. I have no idea when it got turned on, but it cost me a 12v coil!
 
Thats what I found. Yellowy wax on the side of the coil and dripped
all underneath. I picked up a new one and replaced the points and
plug wires while I had it off. Tomorrow Ill know if I did it right or not.
Thanks for everyones help.
 
(quoted from post at 13:38:26 04/08/21) I suspect there is a band of burglars around who do nothing but sneak in & turn keys on! Anyway I happened to notice the key on my '52 Major was on the other day. I have no idea when it got turned on, but it cost me a 12v coil!
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My tractor sits outside and they hit me on a regular basis. All it costs me is a jump start - tractor is a diesel :shock:

TOH
 
(quoted from post at 10:23:03 04/08/21) From the top of the coil to the pig tail should be around 1 ohm for a 6 volt and 2-3 ohms for a 12 volt. From the top of the coil to tab, cap contact, should be around 6K ohms.
Click to expand...

Add this to my N notes on my computer.

Sometimes with key on you get lucky and the points are open
 
(quoted from post at 10:23:03 04/08/21) From the top of the coil to the pig tail should be around 1 ohm for a 6 volt and 2-3 ohms for a 12 volt. From the top of the coil to tab, cap contact, should be around 6K ohms.
Click to expand...


Jim your values are good but your terminology is not likely going to do most readers much good. Coils have terminals only at the top.
 
(quoted from post at 06:16:57 04/09/21)
(quoted from post at 10:23:03 04/08/21) From the top of the coil to the pig tail should be around 1 ohm for a 6 volt and 2-3 ohms for a 12 volt. From the top of the coil to tab, cap contact, should be around 6K ohms.
Click to expand...


Jim your values are good but your terminology is not likely going to do most readers much good. Coils have terminals only at the top.
Click to expand...
llo? Not on the front mount 8N that poster said he has.
 
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