Re: Relocating battery to trunk
[Re: justinp61]
#2848848
11/19/20 09:55 PM
11/19/20 09:55 PM
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Joined: Jan 2003
Posts: 10,743 North Dakota
6PakBee
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I relocated my battery to the trunk, put it in a NHRA approved box and discovered that the battery is puking acid in the box and it's dripping out around the hold down bolts. The car has a Powermaster GM one wire alternator and according to them is functioning properly. Now I need to rethink my battery selection.
Exactly what Powermaster are you using? I see they have a version with an adjustable voltage regulator. As to voltage, 14.8 seems a little high.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Relocating battery to trunk
[Re: justinp61]
#2848969
11/20/20 10:37 AM
11/20/20 10:37 AM
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Joined: Jan 2003
Posts: 10,743 North Dakota
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The acid is definitely coming out the vents. The voltage tests I did were with the engine running at idle and probably 4k rpms.
I'll have to check the p/n, its a cs121 gm alternator. For some reason 6030 comes to mind, I'll double check though. That would be helpful. As a note, I tried to find the battery you are using and the closest Deka I could find in a group 24 marine starting battery was part number 24M7 at 800 CCA.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Relocating battery to trunk
[Re: justinp61]
#2850340
11/23/20 11:04 AM
11/23/20 11:04 AM
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Joined: Jan 2003
Posts: 10,743 North Dakota
6PakBee
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It tested 14.7-8v at the alternator at idle and 14.8 + at I'd guess 4000 rpms, at the battery it tested 14.5-6v at idle. When I called Powermaster I gave the tech the p/n for the alternator and asked what the idle output should be? after telling him what size pulleys I'm running he said 14.8v. Then I gave him what my voltage readings were and he told me that my charging system was working perfect. This intrigued me so I sent an email to the Deka tech line asking about allowable charging voltages for the 24M7 and here is the response: "Good morning, the operation should be 12.6 - 12.8 , when is charging 13.5 - 14.2" From this I think you may be overcharging your battery. You may want to check with Deka yourself as I could have misrepresented something.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Relocating battery to trunk
[Re: 6PakBee]
#2850545
11/23/20 03:15 PM
11/23/20 03:15 PM
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Joined: Oct 2003
Posts: 11,684 W. Kentucky
justinp61
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It tested 14.7-8v at the alternator at idle and 14.8 + at I'd guess 4000 rpms, at the battery it tested 14.5-6v at idle. When I called Powermaster I gave the tech the p/n for the alternator and asked what the idle output should be? after telling him what size pulleys I'm running he said 14.8v. Then I gave him what my voltage readings were and he told me that my charging system was working perfect. This intrigued me so I sent an email to the Deka tech line asking about allowable charging voltages for the 24M7 and here is the response: "Good morning, the operation should be 12.6 - 12.8 , when is charging 13.5 - 14.2" From this I think you may be overcharging your battery. You may want to check with Deka yourself as I could have misrepresented something. You may very well be right, it was my first thought too, just not thinking about the battery not being able to handle the voltage, but the alternator output being to high. It appears I need an automotive type battery. Thanks.
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Re: Relocating battery to trunk
[Re: justinp61]
#2850625
11/23/20 06:09 PM
11/23/20 06:09 PM
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Joined: Jan 2003
Posts: 10,743 North Dakota
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I'm not so sure that an automotive battery is the answer. 14.8 volts is a fairly high charging voltage. I would recommend you review the following document. A GUIDE TO BATTERY CHARGINGAn excerpt from that is "Although a battery is called a '12 volt' battery, its voltage varies from about 12.6 volts down to 10 volts when it is discharging and can rise to 15 or 16 volts during charging. It is very important, however, to limit the maximum battery voltage during charging otherwise the battery will be damaged. The battery voltage should not exceed 13.8 volts for long periods and 14.4 volts for short periods (8 hours maximum)"
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Relocating battery to trunk
[Re: 6PakBee]
#2851116
11/24/20 09:19 PM
11/24/20 09:19 PM
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Joined: Jan 2003
Posts: 15,462 Omaha Ne
TJP
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I'm not so sure that an automotive battery is the answer. 14.8 volts is a fairly high charging voltage. I would recommend you review the following document. A GUIDE TO BATTERY CHARGINGAn excerpt from that is "Although a battery is called a '12 volt' battery, its voltage varies from about 12.6 volts down to 10 volts when it is discharging and can rise to 15 or 16 volts during charging. It is very important, however, to limit the maximum battery voltage during charging otherwise the battery will be damaged. The battery voltage should not exceed 13.8 volts for long periods and 14.4 volts for short periods (8 hours maximum)" 13.8 TO 14.2 is what i was taught, anything over 14.5 is starting to get a little ti high IMO. one has to make sure grounds, accumulative V drops or the V regulator are not what's over driving the charging rate
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Re: Relocating battery to trunk
[Re: TJP]
#2856850
12/07/20 11:00 PM
12/07/20 11:00 PM
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Joined: Jan 2003
Posts: 5,791 Hamilton, Ontario Canada
Magnum
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I like the Ford solenoid in the trunk idea too. It will make the heavy starter wire dead until cranking. You will then need to jump the small to big lead on your starter.
To be NHRA legal, you will need to cut the charging system with a switch at the back of the car. I have done this a couple times in the past by running the charge wire through the switch but you lose alot of charge voltage running the wire the length of the car twice. If I was to do that again. I'd use the switch to interuppt the field circuit.
69 Super Bee, 93 Mustang LX, 04 Allure Super
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Re: Relocating battery to trunk
[Re: mopars4ever]
#2857260
12/08/20 07:12 PM
12/08/20 07:12 PM
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Joined: Jan 2011
Posts: 15,911 Central Florida
larrymopar360
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So you all are saying a gel car battery needs to be vented also? I`m asking because I don`t know. What about the ones that are sealing the small gel battery inside a old resto battery case like others here have done? I believe so. The factory battery in my Charger is a gel I believe, and vented.
Facts are stubborn things.
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Re: Relocating battery to trunk
[Re: B1MAXX]
#2857552
12/09/20 11:03 AM
12/09/20 11:03 AM
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Joined: Jan 2003
Posts: 5,791 Hamilton, Ontario Canada
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master
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be careful switching on and off an alt. field, it can act like a coil inducing a voltage spike on your ignition circuit. There is right and wrong ways to do it. Guess which way I came up with. I scrolled up and I guessed which way you came up with but still do not know.
69 Super Bee, 93 Mustang LX, 04 Allure Super
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Re: Relocating battery to trunk
[Re: moparx]
#2858928
12/12/20 12:49 PM
12/12/20 12:49 PM
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Joined: Jan 2011
Posts: 15,911 Central Florida
larrymopar360
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i was strongly considering relocating the battery to the trunk of my charger, but seeing the inner fender under the battery tray is crusted up because of battery acid and gasses, thus needing repair, i'm now thinking i will modify that area for one of those light weight tiny AMG batteries. . Hopefully the box will protect any type of leakage. I really want the weight transfer. I didn't know the AMG batteries were that small and light weight.
Facts are stubborn things.
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