CITIWIDE Posted March 15, 2018 Share Posted March 15, 2018 Recently acquired a 1961 B42. Would not run. Compression was only at 30 lbs. We have refreshed the engine, new rings, rod and mains, had the block honed, valve done, etc. We can't seem to get the spark correct. The spark looks weak. Have changed the coil and points. Originally truck came with positive ground, it is not now. Could that be a factor? Lost. Quote Link to comment https://www.bigmacktrucks.com/topic/52815-b42-ignition-info/ Share on other sites More sharing options...
j hancock Posted March 16, 2018 Share Posted March 16, 2018 Did you change it to 12 volt neg. ground? Are you using a 12 volt coil? Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/52815-b42-ignition-info/#findComment-394265 Share on other sites More sharing options...
HarryS Posted March 16, 2018 Share Posted March 16, 2018 I don't know why but have always heard the primary coil wires should be reversed when switching from pos to neg. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/52815-b42-ignition-info/#findComment-394266 Share on other sites More sharing options...
eddeere Posted March 16, 2018 Share Posted March 16, 2018 I agree with Harry S . Have always switched the the coil wires when changing from pos to neg ground and has always worked . 1 Quote Link to comment https://www.bigmacktrucks.com/topic/52815-b42-ignition-info/#findComment-394268 Share on other sites More sharing options...
j hancock Posted March 16, 2018 Share Posted March 16, 2018 Yup, the voices in my head say negative ground vehicles will have a wire between the negative terminal on the coil and the distributor, A wire from the positive coil terminal will go to the ignition switch. 1 Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/52815-b42-ignition-info/#findComment-394282 Share on other sites More sharing options...
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