The Ford Barn

31Vic · 04-28-2018, 07:56 AM

Have had a fine working 12V conversion Delco alternator on 1931 Model A pickup daily driver for quite a few years. Also has battery cutoff switch on positive wire between battery post and starter. Problem: Regulator in alternator does not seem to function all of a sudden. Ammeter shows discharge to high charge corresponding to engine speed. Normally, the charge rate shown adjusts to near zero, compensating for current draw. Yesterday, I accidentally shut off the battery cutoff prior to turning off ignition key. Engine keeps running. Wondering if this damaged regulator inside alternator? Main question is if this is fixable and how to fix, or have to replace alternator? Delco "3 wire" set up: wire from post on back of alternator to ammeter, cross wire from this post to plug on top of alternator and 3rd wire from plug on top through diode to ignition. Thanks.

04-28-2018, 07:56 AM	#1
31Vic Junior Member Join Date: Dec 2015 Posts: 2	12V Delco alternator problem Have had a fine working 12V conversion Delco alternator on 1931 Model A pickup daily driver for quite a few years. Also has battery cutoff switch on positive wire between battery post and starter. Problem: Regulator in alternator does not seem to function all of a sudden. Ammeter shows discharge to high charge corresponding to engine speed. Normally, the charge rate shown adjusts to near zero, compensating for current draw. Yesterday, I accidentally shut off the battery cutoff prior to turning off ignition key. Engine keeps running. Wondering if this damaged regulator inside alternator? Main question is if this is fixable and how to fix, or have to replace alternator? Delco "3 wire" set up: wire from post on back of alternator to ammeter, cross wire from this post to plug on top of alternator and 3rd wire from plug on top through diode to ignition. Thanks.