Barry Posted November 19, 2008 Share Posted November 19, 2008 R Model 12 volt Positive Ground Wiring Diagram Here is a wiring diagram showing 12 volt positive ground for the old R & U Models... Author Barry Category Antique & Classic Mack Info Submitted 11/19/2008 08:57 PM Updated 11/19/2008 09:01 PM Barry - Watt's Truck Center Parts Manager and BMT Webmaster...1-888-304-MACK Link to comment https://www.bigmacktrucks.com/topic/5353-r-model-12-volt-positive-ground-wiring-diagram/ Share on other sites More sharing options...
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