Beaverdam 22 Posted October 22, 2016 I have a B77 Mack with a 335 turbo cummins can I put a one woe alternator on it looks like it has a Chevy style alternator on now if I can what amp size should I buy Quote Share this post Link to post Share on other sites
mrgumby 62 Posted October 23, 2016 24SI™ Brush Type Alternator this should work Quote Share this post Link to post Share on other sites
Beaverdam 22 Posted October 23, 2016 Hey thanks for the help Quote Share this post Link to post Share on other sites
Beaverdam 22 Posted October 23, 2016 When hooking up a one wire alternator on a truck with more then one battery ware do you hook the wire off the alternator Quote Share this post Link to post Share on other sites
mrgumby 62 Posted October 23, 2016 (edited) t the starter seloniod or the positive of the closest battery Edited October 23, 2016 by mrgumby Quote Share this post Link to post Share on other sites
41chevy 9,747 Posted October 23, 2016 1 minute ago, mrgumby said: to the positive of the closest battery As long as the system has been converted to a Negative ground. There is, if needed a one wire Positive ground one wire GM style alternator, I have a 120 amp one on my B mixer. Quote Share this post Link to post Share on other sites
mrgumby 62 Posted October 23, 2016 i was going to mention that about pos ground but i figured most trucks by now were converted to neg ground..everyone i know has.. an easy swap wasn.t thinking so good point glad you brought it up Quote Share this post Link to post Share on other sites
41chevy 9,747 Posted October 23, 2016 3 minutes ago, mrgumby said: i was going to mention that about pos ground but i figured most trucks by now were converted to neg ground..everyone i know has.. an easy swap wasn.t thinking so good point glad you brought it up Seems there is always a few that surface, like mine. Quote Share this post Link to post Share on other sites
mrgumby 62 Posted October 23, 2016 also is it a twelve volt starter or 24 if its a24 then to battery not selonoid post Quote Share this post Link to post Share on other sites
Beaverdam 22 Posted October 23, 2016 Hey thanks for all the help I have converted my tractors over to 12v an a few old cars I just wasn't sure about my Mack it was at one time 24 volt it has been converted to 12 volt negative ground but who ever in the past done a bad job I have got to rewire the truck thire are cut an loose wires hanging every ware nothing works but I did get the factory radio working I thought that was amazing thanks for all the help from those who commented I am glad I joined this site it's amazing the knowledge y'all have the is a great resource for anyone who has never restored old road tractor thank alot 2 Quote Share this post Link to post Share on other sites
BillyT 543 Posted November 21, 2016 I was unaware that early Macks were positive ground until I tried to hook up a Buick radio backwards in a late 60s R model 😁 1 Quote Share this post Link to post Share on other sites
