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Ford 9N, 2N & 8N Discussion Forum
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Ballast bypass (for starting only)

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North of Fargo

04-02-2004 19:31:06




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Any one ever tried this? Seems to me it used to be a standard auto feature. The ballast resistor is bypassed when starter is engaged so you don't lose spark voltage due to the battery "sagging" from the starter load. Would be fairly easy to rig up a relay triggered by the start button which would bypass the ballast resistor while cranking. I figure if your front mount coil gets 4.5V with a 6V battery it must only get about 3.5V when cranking. The bypassed voltage would probably be about 5V or so. Too dangerous for fragile frontmount coils?

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Bob

04-02-2004 22:39:14




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 Re: Ballast bypass (for starting only) in reply to North of Fargo, 04-02-2004 19:31:06  
There are two types of ballast resistors, temperature compensated, and non temperature compensated. The 'N resistor is supposedly temperature compensated. What this means is, when first starting the resistor is at a lower resistance, and supplies near battery voltage to the coil. After running one to two minutes, the resistor heats up from the current flowing through it, and reaches a higher resistance value to protect the points and coil.

On systems with a starting bypass circuit, the ballast resistor is always a constant, higher, resistance value, and starting is aided by a system that bypasses the resistor and supplies full battery voltage to the coil during cranking.

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North of Fargo

04-03-2004 12:05:14




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 Re: Re: Ballast bypass (for starting only) in reply to Bob, 04-02-2004 22:39:14  
Thanks Bob, that makes perfect sense. So it's acting more as a "thermistor". Just wondering what the voltage drop is across it cold and how fast it heats up. Seems to me some folks measure 4.5V at the coil cold (points closed) so it must be pretty quick.



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Upper Peninsula, Mich

04-02-2004 20:13:47




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 Re: Ballast bypass (for starting only) in reply to North of Fargo, 04-02-2004 19:31:06  
North of Fargo. I have a bi-pass on one of the 9N's and for the five years it's been on no problem. Don't use it much, except in real cold weather, like below zero, and only for a short time. I just installed a push\pull switch on the dash that bi-passes the ballast resistor when pulled out. Just remember to push it back in again after starting. Good luck. Ron



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