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#1 |
Registered User
Join Date: Apr 2014
Location: Sumrall, MS
Posts: 381
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NEED HELP PLEASE. 17 volts on alt. overcharging
Ok I just got my 67 in and blew a cheap battery out of it. Figured it was just cheapo previous owner installed. Well I put a dura last agm gel battery in and fired her up. Since my volt gauge stayed dead center all times I figured I would put my volt meter on the batter. And wow it would put out up to 17.8 volts as I increased rpms. I know this is not correct. Can anyone give me some guidance on what to check and what color wires to check. Maybe a fuse is blown on the gauge. How do I check this out.
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#2 |
Registered User
Join Date: Feb 2008
Location: Tacoma Washington
Posts: 890
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
Separate voltage regulator? Can you post some pics? These trucks end up with at least one of everything electrical that GM has ever made.
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I know a guy who's addicted to brake fluid. He says he can stop any time. 72 K10 396 75 Cj5 MPI 350 Chev 67 Chevelle 396, 4 speed 74 FXE 08 Tahoe |
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#3 |
Registered User
Join Date: Apr 2014
Location: Sumrall, MS
Posts: 381
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
Yes it has a seperate voltage regulator. I will take some pics this afternoon when I get in. Tganks
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#4 |
Cluster King
![]() Join Date: Nov 2012
Location: Junction City, OR
Posts: 5,263
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
Your voltage regulator is stuck. Replace it immediately to prevent any damage to other circuits. Any thing un-fused as well as bulbs will most likely fail if this is not repaired. I would expect that you would blow some fuses also.
Good call on the meter check. You should never have over 14.5 for any reason.
__________________
Contact me on all of your gauge cluster needs. I specialize in restoration, repair and parts sales for 67-72 Chevy and GMC trucks. email me at tbonegarris@yahoo.com I am also a dealer for Counterpart for gauge cluster parts only. Also see my facebook page, CG&C |
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#5 |
Registered User
Join Date: Apr 2014
Location: Sumrall, MS
Posts: 381
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
Yeah already had a headlight blow and a running light. I may just get a gm one wire as I hate trying to trace down regulator problems and such. May get a regulator first though. Is there a way to check tge voltage gauge???
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#6 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,217
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
Make sure the regulator is grounded. A reg. that is not grounded will go to infinity. There is a small hole in the side of the base. A metal screw goes in it to fasten a ground wire. Its best to run this wire to the ground on the alt. The reg. is mounted on rubber mounts.
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#7 |
Registered User
Join Date: Apr 2014
Location: Sumrall, MS
Posts: 381
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
Can anyone tell me the pin outs on the regulator and what they should be getting and receiving voltage wise?
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#8 |
Registered User
![]() Join Date: May 2013
Location: WEST PALM FLORIDA
Posts: 1,174
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
I had the same issue , replaced the regulator and fixed it
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68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive |
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#9 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
Just wondering what the lower limit is before having charging issues?
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MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#10 | |
Registered User
![]() Join Date: Nov 2012
Location: Whidbey Island/Edmonds,WA
Posts: 360
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
Quote:
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If I have to be on 4 wheels, It has to be a classic Chevy 1967 c10 Longbed (Hawghauler/Icy weather transport) 2003 BMW K1200GT (Rain bike) 2007 Softail Deuce (Sun bike) 2009 Ultra Classic Electra Glide (Everything else bike) |
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#11 |
Registered User
Join Date: Apr 2014
Location: Sumrall, MS
Posts: 381
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
Well I bought a new regulator and got home to find mine was not original and a bit of a hack job. So I simply pulled the alt and went back to autozone and grabbed a single wire gm alt and left everything unhooked but the positive wire. Will not charge more than 14.6 volts now. Thanks for all the advice but over the years of trying to trace down a regulator issue or wiring I have found a gm one wire has served me well over the years. Ps. With my rewards card the alt was 36 bucks and has a free lifetime replacement. My trucks not a cherry so not being complete original does not worry me. The regulator was 29. Bucks lol
Next issue. Can anyone tell me how the charge gauge works and the pin outs on it. I am going to test it and see if I can't get it working. |
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#12 |
Registered User
Join Date: Feb 2008
Location: Tacoma Washington
Posts: 890
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
I wasn't really happy with the one wire on my 72 so I went back to the 2 wire.
__________________
I know a guy who's addicted to brake fluid. He says he can stop any time. 72 K10 396 75 Cj5 MPI 350 Chev 67 Chevelle 396, 4 speed 74 FXE 08 Tahoe |
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#13 |
Registered User
Join Date: Apr 2014
Location: Sumrall, MS
Posts: 381
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
What kind of problems did she show u????
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#14 |
Registered User
Join Date: Feb 2008
Location: Tacoma Washington
Posts: 890
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
Just didn't seem to keep the battery as charged. I may have just needed a bigger wire. When I talked to my alternator guy about my theory that the one wire wasn't doing it he looked at me like I was the last kid in class to get it and said "we don't do a lot of those". Since they have fixed all my alternators (usually costs about $10 to $15) and have replaced some that were years out of warranty, I tend to listen to the man. He's a gold mine. Not too many places you can walk in to, drop a broken alternator on the counter, grunt, and walk out ten minutes later with a rebuilt with your pulley installed or your repaired alt.
__________________
I know a guy who's addicted to brake fluid. He says he can stop any time. 72 K10 396 75 Cj5 MPI 350 Chev 67 Chevelle 396, 4 speed 74 FXE 08 Tahoe |
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#15 |
Chance
![]() Join Date: Sep 2001
Location: Belcourt ,ND, USA
Posts: 750
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
Go to a one wire alternator. Just buy that jumper kit and a one wire alternator. I did and I have not had any problems in three years.
__________________
1968 Chevrolet Stepside BB 396 w/TH400 1972 Chevrolet 3/4 Ton 4x4 BB 496 w/TH400 |
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#16 |
Registered User
Join Date: Apr 2014
Location: Sumrall, MS
Posts: 381
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
I put a one wire on it. What jumper kit are you talking about
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#17 | |
Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,359
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
Quote:
Two important things to note are: (1) There are two 4 amp inline fuses that protect the ammeter and it's wiring from overloads and short circuits. Check to make sure both of those fuses are good. And (2) the output of the alternator (no matter what type it is) needs to be connected to the factory junction point in the wiring. If the alternator output is routed directly to the + battery terminal, it bypasses the ammeter's "shunt" wire and it will no longer be able to register the charging current. If those things are all okay, check the connections on pins #1 & #12 of the instrument cluster connector (black w/white stripe & black wires). Also check the cluster's printed circuit for burned/damaged traces and check the connection points where it's attached to the back of the meter. |
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#18 |
Registered User
Join Date: Apr 2014
Location: Sumrall, MS
Posts: 381
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
It's still charging through the factory harness. I will check the fuses. Thanks for the help
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#19 |
Registered User
Join Date: Apr 2014
Location: Sumrall, MS
Posts: 381
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
Any idea where these two fuses should be located??????
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#20 |
Registered User
Join Date: Apr 2014
Location: Sumrall, MS
Posts: 381
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
Ok just found one behind passenger side headlight not hooked to anything. Has an eyelet connector on it. What's it suppose to hook too
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#21 |
Registered User
Join Date: Apr 2014
Location: Sumrall, MS
Posts: 381
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
IT LIVES!!!!!!! thanks for all the help. Found both fuses were blown and the one at the battery was disconnected. Hooked it up. New fuses and instead of being dead center if floats a little bit above center and increases a little as rpms increase. Extremely happy. Thank y'all so much.
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#22 | |
Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,359
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
Quote:
The other fuse should be on the driver side ... somewhere near the original voltage regulator location on the radiator support. EDIT ... looks like I was a little late typing that up ![]() |
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#23 | |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: NEED HELP PLEASE. 17 volts on alt. overcharging
Quote:
The other wire is connected to the joint with the alternator output wire and the shunt wire from the battery and the red sensing wire in the bottom center of the diagram. This is the diagram. This is a condensed version. It shows the alternator and regulator wiring as it is in the factory version. The destination of the two wires is in the console cluster plug at pins 1 and 12 that plugs into the instrument cluster. These are both positive wires and do not have to be wired through the key switch because there is no current draw on the circuit. If you expect the battery gauge to work with a one wire alternator or with the three wire you must run the output wire on the alternator to the junction shown in the diagram where the stock wire is routed. If you wire it directly to the battery terminal like the one-wire directions say, then the battery gauge will not be able to measure a voltage difference between the alternator and the battery. It must be wired on one end of the shunt and the battery must be wired on the other end. Just like the first diagram shows. The battery gauge has nothing to do with whether the alternator charges or not so don't get confused by that. So if the gauge is good, the fuses are good, and the wiring is correct the gauge should work like the factory designed it to work.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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