Old Blue Posted February 1, 2017 Share Posted February 1, 2017 Have a 1958 B-81 that I'm wanting to update to 12 volts instead of the 24volt system. Deleted the series parallel switch and updated to starter to a MT39. Now I would like to get rig of the generator and instal a alternator. Looking to change it to a negative ground instead of a positive ground. So any suggestions on what alternator to use would be a lot of help. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/48581-b81-update-alternator-suggestions/ Share on other sites More sharing options...
j hancock Posted February 1, 2017 Share Posted February 1, 2017 Something like a Delco 24 SI would be OK for a hobby truck. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/48581-b81-update-alternator-suggestions/#findComment-360443 Share on other sites More sharing options...
Freightrain Posted February 2, 2017 Share Posted February 2, 2017 I don't even know what model I have. Got it the same time I got my starter and batteries. One wire unit, works fine. I reused the existing bracket, just spaced the alternator to line up and re engineered the slide bracket for adjustment. Pretty simple. Then all you have to do is switch the wires on the back of the AMP meter. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/48581-b81-update-alternator-suggestions/#findComment-360560 Share on other sites More sharing options...
Maddog13407 Posted February 2, 2017 Share Posted February 2, 2017 think I used a delco 21 or 22 SI. Quote Link to comment https://www.bigmacktrucks.com/topic/48581-b81-update-alternator-suggestions/#findComment-360568 Share on other sites More sharing options...
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