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Ford 9N, 2N & 8N Discussion Forum

What's wrong here?

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08-01-2003 14:45:00

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An elderly friend of mine called me about checking his timing on his 51 6v 8n. I had already helped him rebuild his carb and it ran good but he wanted to have timing checked. When I went over to do it, his battery was dead and it would not fire with 12 v jumping straight to the starter. He got a battery next day and said it cranked and he moved it and would I come and check the timing? When I got there I noticed he had installed the battery (6v) with negative ground. I asked him if it was not supposed to be positive ground? and he said he put it in positive ground and it would not turn over and would only make a clicking sound at the solenoid. We went ahead and cranked it with negative ground and set the timing but it was showing discharge on ammeter. What's wrong here? thanks.

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roger '40 9n

08-01-2003 15:29:37

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 Re: What's wrong here? in reply to Bobeque, 08-01-2003 14:45:00  
Nothing wrong. Your ammeter is set up for positive ground.
You are now running negative ground.
So your ammeter will read backwards --
showing negative means that your battery is charging. If you want your ammeter to read the other way
reverse the wires on the terminals on the back of the ammeter or if you have the loop type ammeter
just run the wire the other way through the loop.

One way to test is to turn on your headlights
with the tractor engine not running. The ammeter
will show discharge if it is correctly hooked

Roger in Michigan

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08-01-2003 14:52:49

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 Re: What's wrong here? in reply to Bobeque, 08-01-2003 14:45:00  
Forgot to repolarize the generator. It got it's polarity reversed when it got switched over to negative ground, so now that it's back to positive ground, it's trying to push negative current to the positive on the battery, which just grounds the battery out basically. I'm not an electrical whiz and what I just said could be waaaaay off, but I'm pretty sure that the first thing you should do is re-polarize the genny.

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08-01-2003 14:47:02

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 Re: What's wrong here? in reply to Bobeque, 08-01-2003 14:45:00  
when my battery terminals are not tight enough, I get clicking too...

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