UKPlymouth Posted April 13, 2007 Report Posted April 13, 2007 Before I took my coil out I wrote down that the positive wire went to the loom and the negative to the distributor. This is the opposite to what my manual says. The car is still 6V negative earth. Now that I have re-assembled everything I have a spark at the coil but not at the plugs. New plugs, rotor, distributor cap, points and condenser. Set timing statically, checked and re-checked, leads are on firm, checked and re-checked......really struggling now. Quote
Merle Coggins Posted April 13, 2007 Report Posted April 13, 2007 If your car is indeed Negitave earth (neg. ground to us Yanks) than your notes are correct. It was probably converted from Positave ground, since that's how they were manufatured (as far as I know). On a Pos. ground system the + side goes to the distributor and the - side to the ignition switch. Quote
Jim Yergin Posted April 13, 2007 Report Posted April 13, 2007 It has been pointed out on this forum in the past (I think by greg g) that there are different distributor caps used on the six cylinder mopar engines. The caps vary in size and are not interchangeable. Is it possible that your new distributor cap is incorrect and therefore there is no juice flowing to the spark plugs? Jim Yergin Quote
Chester Brzostowski Posted April 13, 2007 Report Posted April 13, 2007 If it was running before you took it apart you should put the wiring back the same way. I don't understand the 6 VDC negative ground setup. I would think the only reason someone might do that was to install a negative ground distributor coil without reversing the wiring. Everything else in the car doesn’t care about polarity. The distributor coil polarity does make a difference for spark. If it ran before you took it apart then it is something you did. This is a good rule of thumb. Troubleshoot what you did or ensure that everything was replaced the same way it was taken appart. My 2 cents, Chet… Quote
Chester Brzostowski Posted April 13, 2007 Report Posted April 13, 2007 It has been pointed out on this forum in the past (I think by greg g) that there are different distributor caps used on the six cylinder mopar engines. The caps vary in size and are not interchangeable. Is it possible that your new distributor cap is incorrect and therefore there is no juice flowing to the spark plugs?Jim Yergin Jim’s post is also a real good possibility. Especially since you said you have spark at the coil wire. Why not put the old distributor cap back on and see if she runs.... Chet... Quote
Don Coatney Posted April 14, 2007 Report Posted April 14, 2007 Everything else in the car doesn’t care about polarity. Chet… Chet; Ignition wise you are correct about polarity not being important except for the coil. The starter motor and heater motor do not care about polarity and will spin the correct direction no matter what way they are hooked up. However the generator will need to be polorized and the amp gauge will read backwards if the polarity is reversed. Also I believe the radio (if the car is so equipped) is polarity sensitive. Quote
billwillard Posted April 16, 2007 Report Posted April 16, 2007 Did You Pull The End Off The Coil Wire Or Brake It? Quote
Chester Brzostowski Posted April 16, 2007 Report Posted April 16, 2007 Chet;Ignition wise you are correct about polarity not being important except for the coil. The starter motor and heater motor do not care about polarity and will spin the correct direction no matter what way they are hooked up. However the generator will need to be polorized and the amp gauge will read backwards if the polarity is reversed. Also I believe the radio (if the car is so equipped) is polarity sensitive. Go figure Don..., what is the advantage of 6vdc negative ground anyway.. ??? It sounds a little strange.???. You are probably right about the generator its been years since I gave dc generators much thought. If there are no stationary magnets involved it might not make any diference. I’m not sure about the radio in that it uses a vibrator to convert the 6vdc to AC to transform the 6VAC from the vibrator into a higher plate voltage for the tubes. Maybe the 6vdc would be used for the filament voltages, in which case it shouldn't make much difference concerning polarity. Like the light bulb the tubes shouldn't mind. Either way it goes I am not sure about the radio or the generator..??? Chet... Quote
martybose Posted April 16, 2007 Report Posted April 16, 2007 The advantage of 6V negative ground was simply that it was easier to make them from a 12V alternator than 6V positive ground! If you radio has an original vibrator, it will work fine with 6V negative ground; if it is a newer electronic one, it won't. My working fine when it was 6V negative ground. Marty Quote
Chester Brzostowski Posted April 17, 2007 Report Posted April 17, 2007 Marty, That sounds right but Don is still correct about the amp meter. The point being is “ if it worked before you took it apart than it is something you introduced to create the problem. I still think Jim Yergin may be on the right track. Chet… What say ye Mr UKPlymouth.... Is it running yet.??? Quote
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