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03-03-2018, 04:32 PM | #1 |
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Join Date: May 2010
Location: Now in Wichita, KS
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Troubleshooting: need nominal 12v ignition coil/condenser values
Ford Barners,
My 47 COE has been converted a while ago to 12V. I have a 12V stock type coil and condenser (from Macs or similar) running with a Napa ignition resistor for 12V vehicle. What are nominal values for the coil (primary and secondary resistance)? What should the matching ignition resistor value be? What capacitance value (microfarads) should the condenser have? My truck started having problems about 8 months ago which manifested itself as a slow power falloff and reduction in rpm to zero. No throttle adjustment would recover rpm stability. Once the engine quit, I could turn off the ignition, turn it back on and hit the starter and the engine would catch and I could continue to drive normally. I've gone through the fuel system and now I'm checking the ignition circuit. Any assistance would be appreciated. Thanks, Dan |
03-03-2018, 04:46 PM | #2 | |
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Re: Troubleshooting: need nominal 12v ignition coil/condenser values
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03-03-2018, 04:48 PM | #3 |
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Location: Now in Wichita, KS
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Re: Troubleshooting: need nominal 12v ignition coil/condenser values
Thanks for the quick reply. I checked the coil and I'm showing 1.4 ohms on the primary and about 7800 on the secondary (at about 60 degrees - might go up a bit when it warms up). I'll check the resistor and the condenser next. Thanks much!
Dan |
03-03-2018, 04:54 PM | #4 |
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Join Date: May 2010
Location: Now in Wichita, KS
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Re: Troubleshooting: need nominal 12v ignition coil/condenser values
Saw your other comments just now. The behavior observered happens occasionally regardless of engine temp. I've had it happen after 20 mins of driving and as little as 5 mins after startup. The coil is mounted in the stock position next to the generator and is elevated above the head by a couple of inches - I don't believe it's getting excessively hot but normal temps might be causing a bad coil to short or open circuit occasionally. The condenser is also mounted in the stock location for a 42 crab cap distributor (truck has the '42 distributor instead of a '47). Ignition resistor is mounted on firewall away from both. Off to check the condenser and resistor...
Dan |
03-03-2018, 05:44 PM | #5 |
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Re: Troubleshooting: need nominal 12v ignition coil/condenser values
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