frickenbored
Well-Known Member
Hi everyone,
I haven't posted in a long while but the last time I was here I got so much great information from a lot of people. I've got another problem so I figured I'd ask for help here again. I have a Case 350 track loader with a case 188 4cyl diesel. It used to have a generator but it was replaced about 30 years ago with a delco si 3 wire alternator that was never hooked up correctly so it never charged, which wasn't a huge problem because it has 2 batteries and zero electronics, the headlights were broken a long time ago.
Well last weekend the vbelt broke so I figured while I was at it, I'd replace the alternator, wire it up to work, and wire some new led headlights. So I ordered a new GM SI internally regulated 63amp 3 wire alternator, some wire, a new ammeter, and an indicator light. I watched a ton of YouTube videos and studied a bunch of 3 wire alternator wiring diagrams.
I mounted the new alternator, ran a wire from a 12v key on circuit, to the idiot light, to pin 1 on the alternator for the excite circuit. Then I ran pin 2 directly to the battery output on the alternator. And finally I ran a thick wire from the batt output to the positive post on the starter solenoid. Following the attached diagram exactly. (I haven't hooked up the ammeter yet, I just wanted to make sure the alternator would charge)
I start the tractor and check across the battery terminals with my meter...nothing. 12.03v. The idiot light is on but dim. I hold a wrench up to the back of the alternator and I can feel a strong magnetic field. When I unhook the thick charging wire from the battery and check it with my meter I get 14v but as soon as I connect it back to the battery positive I get zero charging. I've tried running the charging cable to the starter and to the battery. I added a grounding cable from the alternator to the engine block and still nothing. No matter what I do I get 14v with the charge wire unhooked and 12v with no charging with the charge wire connected. Has anyone ever seen anything like this? I'm not sure where to go from here.
I haven't posted in a long while but the last time I was here I got so much great information from a lot of people. I've got another problem so I figured I'd ask for help here again. I have a Case 350 track loader with a case 188 4cyl diesel. It used to have a generator but it was replaced about 30 years ago with a delco si 3 wire alternator that was never hooked up correctly so it never charged, which wasn't a huge problem because it has 2 batteries and zero electronics, the headlights were broken a long time ago.
Well last weekend the vbelt broke so I figured while I was at it, I'd replace the alternator, wire it up to work, and wire some new led headlights. So I ordered a new GM SI internally regulated 63amp 3 wire alternator, some wire, a new ammeter, and an indicator light. I watched a ton of YouTube videos and studied a bunch of 3 wire alternator wiring diagrams.
I mounted the new alternator, ran a wire from a 12v key on circuit, to the idiot light, to pin 1 on the alternator for the excite circuit. Then I ran pin 2 directly to the battery output on the alternator. And finally I ran a thick wire from the batt output to the positive post on the starter solenoid. Following the attached diagram exactly. (I haven't hooked up the ammeter yet, I just wanted to make sure the alternator would charge)
I start the tractor and check across the battery terminals with my meter...nothing. 12.03v. The idiot light is on but dim. I hold a wrench up to the back of the alternator and I can feel a strong magnetic field. When I unhook the thick charging wire from the battery and check it with my meter I get 14v but as soon as I connect it back to the battery positive I get zero charging. I've tried running the charging cable to the starter and to the battery. I added a grounding cable from the alternator to the engine block and still nothing. No matter what I do I get 14v with the charge wire unhooked and 12v with no charging with the charge wire connected. Has anyone ever seen anything like this? I'm not sure where to go from here.