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Old Dec 5, 2009 | 06:09 PM
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need wiring guru
i have a 79 351m that i am trying to get running out of the truck. i have the motor cranking,gas to it and oil pressure, cant get any spark. i plugged the distributer to the (brain box?)control module. there is another plug with two wires in it a red one and a white one, i know they need to be hooked to something just not sure what. does one get power and one ground?, or both power or what? i tried to look at the diagram with no luck. but the motor is not in a vehicle as i said. how do i get spark?
 
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Old Dec 5, 2009 | 07:39 PM
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Is the brain box grounded to the same ground as the engine?
 
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Old Dec 5, 2009 | 07:45 PM
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yes they are both grounded through the valve cover bolts
 
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Old Dec 5, 2009 | 07:58 PM
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the two red wires are "HOT" one with ign and one in "cranking" if u put 12V to both of them it should start.
 
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Old Dec 5, 2009 | 08:03 PM
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you also need power to the BAT connection on the coil. It will be ok for a bit on full 12 volts....in a vehicle it gets fed through a resistance wire and doesn't get a full 12 volts (except during cranking). I don't the a grounded case is required either.
 
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Old Dec 5, 2009 | 08:03 PM
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the two plugs on the control module are the ones im talking about.the one with 4 wires goes to the distributer. the other plug has a white and a red wire
 
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Old Dec 5, 2009 | 08:06 PM
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+1 what c.l. nye said.
 
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Old Dec 5, 2009 | 08:06 PM
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as previously stated, they are both hot...white is normally hot in crank, red hot in run.
 
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Old Dec 5, 2009 | 08:09 PM
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ok thanks. i have tried both hot and still no spark
 
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Old Dec 5, 2009 | 08:20 PM
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Maybe a quick test with ohm meter making certain ALL grounds are common to one another without any resistance.
 
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Old Dec 5, 2009 | 08:23 PM
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Originally Posted by fdude64
ok thanks. i have tried both hot and still no spark
do you have 12v at the coil BAT+ terminal?
 
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Old Dec 5, 2009 | 08:30 PM
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yes i ran a wire straight from the batt to the red wire side of the coil, power to both red and white wires on module
 
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Old Dec 5, 2009 | 10:34 PM
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thanks everyone for the input ill try again tomorrow
 
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Old Dec 5, 2009 | 10:52 PM
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check out one of the images from this google query to confirm all your connections are correct...

duraspark wiring diagram - Google Search
 
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Old Dec 7, 2009 | 02:55 PM
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thank you everyone for your in put it really helped me out
 
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