kennylane Posted December 6, 2009 Share Posted December 6, 2009 Can anyone tell me if the CF600 Mack fire apparatus had a negative or positive ground? Also can you tell me how to convert if it's positive ground? Are wiring diagrams available anywhere? Quote Character is doing the right thing, even when no one is watching. Kenny Lane Link to comment https://www.bigmacktrucks.com/topic/11698-positive-or-negative-ground/ Share on other sites More sharing options...
609albert Posted December 8, 2009 Share Posted December 8, 2009 Can anyone tell me if the CF600 Mack fire apparatus had a negative or positive ground? Also can you tell me how to convert if it's positive ground? Are wiring diagrams available anywhere?your mack should be a positive ground, every thing on the truck works positive ground,if you have a fire radio it has to be positive ground to operate. the mack musemun would have the specs on the truck and you will get a wiring diagram in the packet. If your engine is gas you will probably have to change the wiring at the coil/distr. if it is diesel I don't know the procedure Quote Link to comment https://www.bigmacktrucks.com/topic/11698-positive-or-negative-ground/#findComment-44787 Share on other sites More sharing options...
Packer Posted December 8, 2009 Share Posted December 8, 2009 Look up:oldmacksrus.comMight give you some great info!!!(Thanks Tom)!!!!!!!!Packer Quote Keep a clutchin' Link to comment https://www.bigmacktrucks.com/topic/11698-positive-or-negative-ground/#findComment-44788 Share on other sites More sharing options...
wxman232 Posted May 19, 2010 Share Posted May 19, 2010 I have a 1979 Mack CF...it's negative ground. As far as I know most CF's were negative ground.Dan Quote Link to comment https://www.bigmacktrucks.com/topic/11698-positive-or-negative-ground/#findComment-55418 Share on other sites More sharing options...
Firemack Posted May 19, 2010 Share Posted May 19, 2010 Dan,By 1979 yours may be negative ground, however most Macks were postiive ground. Yours may have been converted.Firemack Quote Link to comment https://www.bigmacktrucks.com/topic/11698-positive-or-negative-ground/#findComment-55421 Share on other sites More sharing options...
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