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#1 |
Registered User
Join Date: Aug 2018
Location: port colborne
Posts: 36
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voltage reg problem
GOOD DAY ALL
i have spent the day going thru a ton of posts on Voltage Regulators and i cant seem to find anything that covers my specific problem. hoping someone here will set me on the correct path electrically (pardon the pun) 1972 c10 SBC 350 3 wire alternator w external Voltage Reg no A/C no pwr win, stock radio details low charging voltage @ bat when go thru stock reg -by pass reg (test) alternator pitting around 14.9 15.4v i believe this test confirms the alt is okay? so i suspect the VR so went online Napa Canada out in my vehicle details and was directed to purchase VR142SB as exact fit for my truck, so i ordered it. when i got it a became perplexed i thought it would be a matter of plug and play .."as in EXACT FIT" but it doesn't look like it to me see pics any ideas? thanks Mac Last edited by MacataQ; Yesterday at 09:13 PM. Reason: add pic |
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#2 | |
Senior Member
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Location: Tucson, AZ USA
Posts: 7,237
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Re: voltage reg problem
Quote:
It looks like a slight design change. The contact on the left [in both pix] goes thru a heat dissapating resister to ground on the box itself. In the newer version, there's a terminal for you to attach your own ground lead. The Factory also had the VR boxes suspended off the Radiator Core Wall with vibration shedding rubber mounts. I have duplicated this effect by stacking rubber plumbers' washers and this may isolate the VR Box from ground, so groundibg is necessary. To be honest, I had trouble with ''Lifetime Warranty'' replacement parts from O'Reilly's. They bought out Checker Auto and inherited their lifetime warranties, but their replacemts all failed. On my '68 Chevy Stepside, I cannibalized a VR that was on my '67 K/10 Suburban, from 1998. It works fine. On my '71 GMC Jimmy, I got a wiring conversion kit from M&H, and Got a NIB SI-12 Alternator with internal VR. It's working fine.
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Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; Yesterday at 11:38 PM. |
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#3 |
Registered User
Join Date: Aug 2018
Location: port colborne
Posts: 36
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Re: voltage reg problem
orange
thanks for responding it looks like it lines up correctly the new one does not have aground on the casing like the old one Mac |
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#4 |
Senior Moment
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Location: Pittsburg Ca
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Re: voltage reg problem
I seem to remember something about polarization of a VR. Touching one of the wires to get it flowing in the right direction. "??????????
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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#5 |
Registered User
Join Date: Aug 2018
Location: port colborne
Posts: 36
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Re: voltage reg problem
70
not sure on that? any details? Mac |
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#6 |
70+ ( Old Skool Club )
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Location: Saskatoon, Saskatchewan ,Canada
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Re: voltage reg problem
following
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
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#7 |
Senior Moment
![]() Join Date: Mar 2002
Location: Pittsburg Ca
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Re: voltage reg problem
This was a long time ago. I remember something about touching Field to Ground. Probably long forgotten due to new Alts with built in Reg ?????
Any body old enough to remember this or am I Dreaming. LOL I’m only 70 and I think my mind still works OK. ????
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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#8 |
Senior Member
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Location: San Ramon,CA
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Re: voltage reg problem
Isn't the L-shaped contact on the left spot welded to the case, or is that an optical delusion?
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1970 C10 Custom longbed 350/350 |
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#9 |
Senior Moment
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Location: Pittsburg Ca
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Re: voltage reg problem
I’m going to laugh my Ass off if I’m correct here. Do your research, let me know
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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#10 | |
Registered User
Join Date: Aug 2018
Location: port colborne
Posts: 36
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![]() Quote:
im not any better a photographer than electrician! Mac Last edited by MacataQ; Today at 02:20 AM. Reason: pic |
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#11 | |
Senior Member
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Location: Tucson, AZ USA
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Re: voltage reg problem
Quote:
All the VRs I've gotten have a selftapping machine screw w/ 1/4'' hex head that grounds the VR. As I said earlier, because the rubber mounting grommets isolate the VR from road vibrations may also isolate it from Ground.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#12 | |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
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Re: voltage reg problem
Quote:
That's for a Ground lead.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#13 |
Registered User
Join Date: Aug 2018
Location: port colborne
Posts: 36
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Re: voltage reg problem
Orange
yes all the contacts seem mounted on the black plastic piece. so i am assuming that L shaped one is going to be the brown wire on the original VR, using the original female plug. thanks for responding Mac |
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#14 | |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,676
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Re: voltage reg problem
Quote:
MacataQ, now is your chance to upgrade your charging system. Unless you just want to keep things exactly original, you can install an internally regulated alternator.. Minor wiring modifications and you're in business.. How to do this simple procedure is all over the internet, including our own ELECTRICAL forum. |
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#15 | |
Registered User
Join Date: Aug 2018
Location: port colborne
Posts: 36
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Re: voltage reg problem
Quote:
thanks for the clarification...good to know! i have the wiring diagram to switch to internal alt for later when i can afford to do that, but since this alternator tested fine & already bought new VR, ill keep using it.now i understand how the whole thing works! installing tm...er today, will report results thanks Mac |
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