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| Coil voltage and resistor location https://slantsix.org/forum/viewtopic.php?t=53356 |
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| Author: | moparlewellen [ Tue Sep 17, 2013 12:40 pm ] |
| Post subject: | Coil voltage and resistor location |
I have a 1971 Dart with a 225 in it. I checked the voltage at the coil while the engine was running and it read just over 2 volts. that seams too low, whats it suppose to be? and where is the coil resister? the only thing i found was on the fan. |
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| Author: | Aggressive Ted [ Tue Sep 17, 2013 6:32 pm ] |
| Post subject: | |
Depending on idle speed between 6 to 9 volts. The resistor is mounted on the fire wall. Click on the red link and look at mine.....when I used to run a ballast resistor.....with the coil I have (3 ohms) I don't need to run one. |
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| Author: | moparlewellen [ Tue Sep 17, 2013 7:59 pm ] |
| Post subject: | resistor |
Ok thanks it looks like yours is on the left by the fender. Is it possible that I dont have one? Im surprised that the engine even runs let alone at 4500 rpm |
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| Author: | moparlewellen [ Tue Sep 17, 2013 8:16 pm ] |
| Post subject: | resistor |
I found the resistor same place yours is. It was behind the broken cruise module. And how do you check the voltage there? [/img] |
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| Author: | Charrlie_S [ Wed Sep 18, 2013 5:31 am ] |
| Post subject: | Re: Coil voltage and resistor location |
Quote: I checked the voltage at the coil while the engine was running and it read just over 2 volts. .
Are you sure you checked the voltage on the correct terminal of the coil? You should have 6-9 volts on the + terminal of the coil while running. The - terminal of the coil gets switched between open and ground. When it is open there will be 6-9 volts, and when grounded zero volts, so checking while running will give some sort of an "average" reading. Probably slightly over 2 volts. I doubt the engine would run, with only 2-3 volts on the coil.
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| Author: | wjajr [ Wed Sep 18, 2013 5:37 am ] |
| Post subject: | |
Place black VOM lead on good ground (best would be (-) battery post) and red at one of the connection points to resistor; current has to be flowing through resistor for test. Next place red lead at the resistor’s other connection; if it’s a four post resistor read top two as one resistor, and bottom two as second resistor. The side or end connected to Ignition switch (blue wire)of resistor will read around 12 v, the other end, coil side, should read between 6 -9 v as Ted said. To measure resistance, ohms, disconnect both wires from resistor, set VOM on a low DC OHM scale, say“20â€, and one lead on left the other on right terminal of resistor. |
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| Author: | moparlewellen [ Wed Sep 18, 2013 8:43 am ] |
| Post subject: | Coil |
Ok i will Check that after school today but the is also what looks like a capacitor on the positive side of the coil that is bolted to the coil clamp. I can not find the part anywhere. |
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| Author: | Charrlie_S [ Wed Sep 18, 2013 8:53 am ] |
| Post subject: | |
That capacitor is just for noise reduction in the radio. It will only cause a problem if it is shorted. If it is shorted the engine will not run. |
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| Author: | moparlewellen [ Wed Sep 18, 2013 9:02 am ] |
| Post subject: | Capacitor |
Ok thanks, i have an off hour here in a little bit so ill run down to napa and get a new resistor. Since there only $8. |
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| Author: | moparlewellen [ Thu Sep 19, 2013 9:44 am ] |
| Post subject: | Resistor |
I installed a new resistor and the car seams to run better. I still need to check the voltage though. How good is the igniter II electronic conversion?, i'm thinking about getting it. |
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| Author: | Aggressive Ted [ Thu Sep 19, 2013 11:41 am ] |
| Post subject: | |
Quote: I installed a new resistor and the car seams to run better. I still need to check the voltage though. How good is the igniter II electronic conversion?, i'm thinking about getting it.
I would wait for version III since it is built similar to a GM HEI which solves the overheating and eventual burn out problems. I called Pertronix and they are still working on a 6 cylinder version. The GM HEI conversion is much cheaper and proven. There are many options to not running the ballast resistor. I have not used one for years and am running the MOPAR electronic distributor and MOPAR ECU box with a 3 ohm Pertronix HEI coil. It works great but I have the GM HEI ready to go when it fails. |
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