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Ford 9N, 2N & 8N Discussion Forum
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12V confusion???

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Bill(WA)

08-23-2003 00:11:00




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I have read from the archives till my eyes hurt, now my brain hurts too. I'm getting sooooo confused. Dont get mad Dell, your info is great!
I have the front mount 6V dist and coil. I removed the OEM ballast resistor. I purchased a generic ballast resistor from Schucks(not being used at the moment), I also had 2-1ohm 10watt resistors in ceramic,paralleled which is in and being used. With these and the generic ballast resistor, spark was too low to start. Now, is 1/2ohm 20watts enough resistance for 6v coil on 12v system? Do I need to put OEM back in series with 1/2ohmer? One gent said to use OEM resistor with tisco 8NE10306 resistor 'till I get tired of the tractor( I will if I have to, but I'm thinking I gots all the parts I need). Also, I have 1 wire from Batt terminal to field excitation post, other post to side marker lamp. Do I need to run a wire from here to Batt terminal also to sense battery charge level? I havent seen this in any wiring diagrams. This is why I'm getting confused, I really dont mean to kick a dead horse.
Thanks, Bill

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Phil (NJ-AZ-SK)

08-24-2003 05:23:29




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 Re: 12V confusion??? in reply to Bill(WA), 08-23-2003 00:11:00  
Bill, >>>Batt terminal also to sense battery charge level>>

The Alt output (BAT) "MUST" be connecterd with a Jumper to the Voltage Sense... This is what Controls the Regulator in the ALT... Without this Connection the ALT will be at MAX /OP

Regards,



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Bill(WA)

08-23-2003 07:40:32




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 Re: 12V confusion??? in reply to Bill(WA), 08-23-2003 00:11:00  
Thanks guys, I was so tired last night when I posted that message. I already have a meter and will check voltage at the coil. Should be 3.5V with points closed, if I have the right resistor. I also realised afterwards that the P1 terminal is connected to the Battery terminal through the ignition switch-side marker-circuit. I wouldnt have converted the 'ol girl, but I need 12v for a sprayer and hydraulic pump.
Thanks again. Bill

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duey

08-23-2003 04:44:41




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 Re: 12V confusion??? in reply to Bill(WA), 08-23-2003 00:11:00  
He's right, read the voltage. ENGINE OFF, KEY SWITCH ON, at the coil top, you should read battery voltage when the points are open, and the target is approximately 3 volts at the coil when the points are closed.

You know, that is true whether you run 6 volt system OR 12 volt. The ballast resistor helps you in that when the key is first turned on, the voltage it supplies the coil is a bit higher.... nice during start up. But as it warms up, it drops the voltage, making life easier for the coil. Works great, lasts a long time!!! duey

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Larry 8N75381

08-23-2003 04:00:15




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 Re: 12V confusion??? in reply to Bill(WA), 08-23-2003 00:11:00  
Bill,

You need to be able to measure the voltages at thecoil, points, alternator, etc. so you KNOW what is happening. Go to Radio Shack, or Home Despot for that matter, and buy a cheap (under $20) meter. Get an analog one not digital. I say that because in a noisy circuit the digital meters can be very hard to read because the numbers keep changing.

With a volt meter in hand, you can then check to see what voltages you have witht eh points open and then closed at the points/coil. I don't remember the readings you should get but they are in the archives.

With out actually knowing what the voltages are, you are gust guessing about what the various resistors are doing. This is the age old problem with conversions, there is NO standard so that every one knows what is is being used and what it does. Resistors vary widely in their characteristics, even though they may be marked as having the same value. AND often the presumed value is not what the resistor acutally is. There can be as much as a 20% variation in the true resistance. Even in resistors from the same manufacture that are listed as the same value.

Regards,
Larry

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