Re: Overcharge?
[Re: HotRodRailroader]
#2782206
06/06/20 06:00 PM
06/06/20 06:00 PM
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Joined: Aug 2007
Posts: 6,095 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,095
Valencia, España
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Once I got an intermitent short on my alt able to get between 18 up to 24 volts depending on RPMs... but without load, so I disconected the batt and engine died. It was one of the rotor vent vanes getting in touch with one of the stator leads on every spin.
BUT... the engine never increased the RPMs by itself. Just sharing one misterious experience I had
Last edited by NachoRT74; 06/06/20 06:01 PM.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Overcharge?
[Re: lewtot184]
#2782832
06/08/20 02:44 PM
06/08/20 02:44 PM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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when I've had overcharge issues it's always been the voltage regulator had a poor ground. anymore I run a pigtail off the regulator and ground it to the block. On the electronic reg with dual fields the car wont charge if the reg is not grounded since that's the field ground. Course you may be talking of the older mech regulator only ? Working many years at a Dodge dealer I found the two wire connector on the electronic reg would loose its connection at the reg for the batt sense wire but the field wire still had a good connection and of course it would overcharge without knowing batt volts. Unhook the field wire or wires depending on your reg and see if it stops charging like was said. Ron
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Re: Overcharge?
[Re: Mattax]
#2784817
06/13/20 12:31 AM
06/13/20 12:31 AM
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Joined: Jan 2003
Posts: 3,122 Auburn WA
Dave_J
master
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master
Joined: Jan 2003
Posts: 3,122
Auburn WA
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If the battery has a shorted plate it will still show 14.5 Volts but be taking all the Amps the alt can push thru the Amp gauge.
Use all safety gear around battery acid. I'd check to see if you have 2.5+ volts in each port of the battery. 1.Unscrew all filler caps on the battery.
2. Put the BLACK Neg cable of your VOM on the battery's Neg lug. Put the RED Pos cable of the VOM into the acid of the first hole. Should be 2.5 to 2.7 Volts DC. Yes, into the acid. You do not need to touch the lead plate inside.
3. Move the cables of the VOM up a hole and measure.... Rinse and repeat. Should be balanced at all holes.
Retired, US ARMY 1973-1994 ASE mechanic, Electrical 1994-1997 Retired GTE/VERIZON/FRONTIER 1997-2015
Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.
03 Suzuki Burgman 650(Burger King) Scooter 65 Formula S Cuda 78 Little Red Express Truck 98 Buick Regal (wifes car)
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Re: Overcharge?
[Re: Dave_J]
#2784819
06/13/20 12:39 AM
06/13/20 12:39 AM
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Joined: Nov 2007
Posts: 21,825 Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,825
Kirkland, Washington
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If the battery has a shorted plate it will still show 14.5 Volts but be taking all the Amps the alt can push thru the Amp gauge.
Use all safety gear around battery acid. I'd check to see if you have 2.5+ volts in each port of the battery. 1.Unscrew all filler caps on the battery.
2. Put the BLACK Neg cable of your VOM on the battery's Neg lug. Put the RED Pos cable of the VOM into the acid of the first hole. Should be 2.5 to 2.7 Volts DC. Yes, into the acid. You do not need to touch the lead plate inside.
3. Move the cables of the VOM up a hole and measure.... Rinse and repeat. Should be balanced at all holes. I’ve been working with automotive batteries for 50 years. You haven’t a clue about what you are talking about.
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Re: Overcharge?
[Re: Pacnorthcuda]
#2784851
06/13/20 08:20 AM
06/13/20 08:20 AM
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Joined: May 2019
Posts: 6,261 nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,261
nowhere
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If the battery has a shorted plate it will still show 14.5 Volts but be taking all the Amps the alt can push thru the Amp gauge.
Use all safety gear around battery acid. I'd check to see if you have 2.5+ volts in each port of the battery. 1.Unscrew all filler caps on the battery.
2. Put the BLACK Neg cable of your VOM on the battery's Neg lug. Put the RED Pos cable of the VOM into the acid of the first hole. Should be 2.5 to 2.7 Volts DC. Yes, into the acid. You do not need to touch the lead plate inside.
3. Move the cables of the VOM up a hole and measure.... Rinse and repeat. Should be balanced at all holes. I’ve been working with automotive batteries for 50 years. You haven’t a clue about what you are talking about. 50 years wasted http://constructionmanuals.tpub.com/14273/css/Battery-Voltage-Test-40.htm
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Re: Overcharge?
[Re: Dave_J]
#2784855
06/13/20 09:23 AM
06/13/20 09:23 AM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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If the battery has a shorted plate it will still show 14.5 Volts but be taking all the Amps the alt can push thru the Amp gauge.
Use all safety gear around battery acid. I'd check to see if you have 2.5+ volts in each port of the battery. 1.Unscrew all filler caps on the battery.
2. Put the BLACK Neg cable of your VOM on the battery's Neg lug. Put the RED Pos cable of the VOM into the acid of the first hole. Should be 2.5 to 2.7 Volts DC. Yes, into the acid. You do not need to touch the lead plate inside.
3. Move the cables of the VOM up a hole and measure.... Rinse and repeat. Should be balanced at all holes. I have seen this a few times in my 40 plus years as a tech. Battery cell problem where the volts wont go over a certain amount usually from about 13 to 14.5 but put an ammeter in series in the alt output wire and the alt is putting out all it can. I have seen well over 50 amps on cars with alt's that high of amperage and yet the battery volts wont come up enough for reg to cut alt amps back. You have to hook an ammeter up along with a voltmeter to properly diagnose that problem. Put a new battery in and problem solved. But I never checked each cell that way though. Usually a good battery reads about 12.6 or 2.1 volts per cell. Ron
Last edited by 383man; 06/13/20 09:27 AM.
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Re: Overcharge?
[Re: Sniper]
#2784908
06/13/20 11:24 AM
06/13/20 11:24 AM
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Joined: Nov 2007
Posts: 21,825 Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,825
Kirkland, Washington
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If the battery has a shorted plate it will still show 14.5 Volts but be taking all the Amps the alt can push thru the Amp gauge.
Use all safety gear around battery acid. I'd check to see if you have 2.5+ volts in each port of the battery. 1.Unscrew all filler caps on the battery.
2. Put the BLACK Neg cable of your VOM on the battery's Neg lug. Put the RED Pos cable of the VOM into the acid of the first hole. Should be 2.5 to 2.7 Volts DC. Yes, into the acid. You do not need to touch the lead plate inside.
3. Move the cables of the VOM up a hole and measure.... Rinse and repeat. Should be balanced at all holes. I’ve been working with automotive batteries for 50 years. You haven’t a clue about what you are talking about. 50 years wasted http://constructionmanuals.tpub.com/14273/css/Battery-Voltage-Test-40.htm So you agree with his post? 2.5-2.7 volts per cell and you don’t touch the plates? Really?
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Re: Overcharge?
[Re: Pacnorthcuda]
#2784976
06/13/20 02:34 PM
06/13/20 02:34 PM
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Joined: Jan 2003
Posts: 3,122 Auburn WA
Dave_J
master
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master
Joined: Jan 2003
Posts: 3,122
Auburn WA
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If the battery has a shorted plate it will still show 14.5 Volts but be taking all the Amps the alt can push thru the Amp gauge.
Use all safety gear around battery acid. I'd check to see if you have 2.5+ volts in each port of the battery. 1.Unscrew all filler caps on the battery.
2. Put the BLACK Neg cable of your VOM on the battery's Neg lug. Put the RED Pos cable of the VOM into the acid of the first hole. Should be 2.5 to 2.7 Volts DC. Yes, into the acid. You do not need to touch the lead plate inside.
3. Move the cables of the VOM up a hole and measure.... Rinse and repeat. Should be balanced at all holes. I’ve been working with automotive batteries for 50 years. You haven’t a clue about what you are talking about. 50 years wasted http://constructionmanuals.tpub.com/14273/css/Battery-Voltage-Test-40.htm So you agree with his post? 2.5-2.7 volts per cell and you don’t touch the plates? Really? I'm soooo sorry I got it 0.4 volts wrong. You are soooo right. You win the prize for the day. But just try doing the test and see if you get between 2.0 to 2.2 volts in each cell. Not sure who PI$$ED in your Cornflakes this morning.
Retired, US ARMY 1973-1994 ASE mechanic, Electrical 1994-1997 Retired GTE/VERIZON/FRONTIER 1997-2015
Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.
03 Suzuki Burgman 650(Burger King) Scooter 65 Formula S Cuda 78 Little Red Express Truck 98 Buick Regal (wifes car)
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Re: Overcharge?
[Re: HotRodRailroader]
#2786150
06/16/20 09:19 PM
06/16/20 09:19 PM
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Joined: Feb 2010
Posts: 1,645 Phila. Pa.
Mattax
top fuel
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top fuel
Joined: Feb 2010
Posts: 1,645
Phila. Pa.
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The batter yis fully charged? What were the results of checking for voltage differences? (see post 2)
No need to disconnect the regulator. Just measure the voltage the regulator is 'seeing'. That's the 'ign' terminal. After that, check the voltage at the alternator output stud. Compare with voltage at the battery positive. Best done while running.
Last edited by Mattax; 06/16/20 09:23 PM.
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