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 |
VaccaRabite |
Sep 18 2018, 05:32 PM
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#2
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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 |
@spoke
Send me your address and I’ll send a VR care package. I suspect it’s not really the VR, but would be good to cross that off the list. 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 |
Spoke |
Sep 18 2018, 06:53 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 Send me your address and I’ll send a VR care package. I suspect it’s not really the VR, but would be good to cross that off the list. 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 Grounding the alt case to the chassis should not cause an issue. The normal alt case grounding goes from the alt case >> Fan shroud >> engine case >> transmission >> trans strap >> chassis. You have the alt case strapped directly to the chassis. Either way should be milliohms and should not be an issue. If you want to feel better about it, use a very short cable and ground the alt case to the engine case. PM sent with my contact info. If you ship USPS flat rate small box it'll cost about $7 and I can get it this weekend and test. I'll just put them in my 914 and see what happens. My current VR/alt gives a rock solid 14.0V from idle to max RPM. |
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