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GRND/negative when relocate battery to the trunk
#1231454
05/11/12 02:42 AM
05/11/12 02:42 AM
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Joined: Sep 2009
Posts: 393 Sweden
Snoddas
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enthusiast
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OP
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Joined: Sep 2009
Posts: 393
Sweden
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Hi, Have started to take care of old (small) irritation problem on my white 64 dodge 330. When start the car it have been a noice from the starter or some other electrical device. Yesterday we start measure using an oscilloscope. We found a very big lack on voltage when start the car. When we had measuring some spots the resultate was about 6 Volts to the starter. After checking the voltage over starter relay we found that the realy close and open hole time under the starting of engine (that making the noice).
We took the battery and attach it directly at the starter and ground/negative direct on engine and the engine started great and without any bad sounds from start relay or starter.
For info the battery is new and are located in the trunk. The positive cable is 1 gauge and negative is ground in trunk floor (on engine the ground is attach to the firewall).
Its a lack of 2 V ground in chassie when we measured. Adding the lack of voltage in the postive cable and the voltage lack in battery when start/crank the car all that resulting 6 V at the starter.
I'm about route a good ground/negative cable from battery in trunk to the engine.
Strange, almost same battery setup in my 65 coronet havent any problem.
Stay cool.
Last edited by Snoddas; 05/11/12 02:45 AM.
1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone
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Re: GRND/negative when relocate battery to the trunk
[Re: None2Slow]
#1231456
05/11/12 03:34 AM
05/11/12 03:34 AM
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Joined: Sep 2009
Posts: 393 Sweden
Snoddas
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OP
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Joined: Sep 2009
Posts: 393
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Thanks for the reply. Yes, that would be easier than route a long ground cable from trunk.
1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone
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Re: GRND/negative when relocate battery to the trunk
[Re: bb74swngr]
#1231458
05/11/12 10:29 AM
05/11/12 10:29 AM
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Joined: Sep 2009
Posts: 393 Sweden
Snoddas
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enthusiast
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OP
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Joined: Sep 2009
Posts: 393
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The thing is that it works now. I did some improvement on the negative cable where it is attached to the trunk floor. I also installed a new cable shoe on the positive battery cable. The old one wasent that good installed.
1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone
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Re: GRND/negative when relocate battery to the trunk
[Re: bb74swngr]
#1231459
05/11/12 11:21 AM
05/11/12 11:21 AM
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Joined: Jan 2003
Posts: 8,940 Holly/MI
Dean_Kuzluzski
master
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master
Joined: Jan 2003
Posts: 8,940
Holly/MI
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Sorry to split hairs, but there are no "body mounts" on a early B-body.
The factory engine mount "insulators" provide an electrical insulation too. If you have steel mounts or motor bracket you're good.
The K-member is directly bolted to the "Uni-body" framerails that has innumerable spotwelds tying them into the body.
The thin little "groundstrap" that goes from the engine to the firewall is really for the ignition electronics like distributor spark. Even though it's high voltage, it is actually relatively low amperage and that's where big thick wires are needed elsewhere.
Hence the stock battery ground went straight to the engine block/head and the positive cable went straight to the starter which ground to the block too.
As you add length to the cables, you add resistance, so cable gauge needs to get thicker/bigger (number gets lower).
Adding a remote starter relay further complicates matters. If there's internal resistance from low voltage cranking, burned/pitted contacts you're hosed.
Simple things like the size of the terminal/lugs and quality of the crimping/soldering done to transfer current can strand you. And as most know rust/corrosion and loose connections are bad too.
Keep it simple and go overkill.
R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04
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Re: GRND/negative when relocate battery to the trunk
[Re: Dean_Kuzluzski]
#1231460
05/11/12 12:50 PM
05/11/12 12:50 PM
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Joined: Sep 2009
Posts: 393 Sweden
Snoddas
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OP
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Joined: Sep 2009
Posts: 393
Sweden
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Thanks for good information. We also find that out when measuring. If I remeber right it was about 0.5 Volts lack in the big (and long) postive cable.
1964 Dodge 330 Max Wedge clone 1965 Dodge Hemi A990 clone
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