Now I’m overcharging, My car is murdering voltage regulators |
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Now I’m overcharging, My car is murdering voltage regulators |
VaccaRabite |
Sep 18 2018, 12:05 PM
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#1
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En Garde! Group: Admin Posts: 13,465 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
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I’ve been driving my car all over for the past week or so. Last weekend I noted that it was hard to start, and it stalled while pulling away in 1st once. Weird. Didn’t worry about it and finished my drive. Got home and I checked voltage at the battery and I was making 18 volts, my VR had seemed to fail and I was pushing max voltage at the battery. Geeze, no wonder the car was hard to start with the alternator at max effort. So, I’ve done the ground thing and they are all clean and good. In my undercharging thread I ran a 10ga wire from the alternator case to the body ground point near the relay board in the engine bay. I’ve also checked all my collection of voltage regulators and all 5 of them, be they mechanical or solid state are now allowing the alternator to go full bore all the time. This is with both the brand new battery and the PC680 gell cell race battery. What do I look for now? Could I have broken the VRs by pulling them off the running car while chasing issues with the alternator last time? Or is this a car thing and I need to fix something else. The car is essentially acting like I have D+ and DF jumped with D- left empty. Zach |
toolguy |
Sep 18 2018, 05:45 PM
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#2
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Senior Member Group: Members Posts: 1,270 Joined: 2-April 11 From: San Diego / El Cajon Member No.: 12,889 Region Association: Southern California |
@spoke Is it possible that by grounding the alt case directly to the chassis I have done an end run around something which is causing this issue? Zach Isn't an alt case already grounded to the chassis via the normal mounting bolts ??? |
Spoke |
Sep 18 2018, 06:59 PM
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#3
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Jerry Group: Members Posts: 6,991 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None |
@spoke Is it possible that by grounding the alt case directly to the chassis I have done an end run around something which is causing this issue? Zach Isn't an alt case already grounded to the chassis via the normal mounting bolts ??? Yes, that's the theory. The alt case is grounded via: alt case >> Fan shroud >> engine case >> transmission >> trans strap >> chassis. In Zach's car the fan shroud and alt hanger were powder coated which caused probably only 0.5 ohm of resistance or less. 1/2 ohm doesn't sound like much but for example run 2 amps through 0.5 ohm and it drops 1V. The VR should hold the alt voltage to 14V so losing 1V means 13V at the battery. Turn on the headlights and the draw goes to 5-10A and the battery discharges while driving. |
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