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04-14-2020, 06:02 PM | #1 |
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Join Date: May 2010
Posts: 146
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model a battery disconnect question
does it make a difference whether you use the positive or negative post to attach a disconnect. Also the usual imported ones are troublesome. I spent a few hours when my car wouldn't start before i found out that the connections are hard to tighten properly. Any hints or ideas appreciated.
Thanks Pete also best email address for me [email protected] |
04-14-2020, 06:52 PM | #2 |
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Location: Melbourne, Australia
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Re: model a battery disconnect question
Not knowing whether your car is 6 volt +ve earth (ground) or 12 volt -ve earth, I will not say +ve or -ve, just active or earth side of the battery. It is best to put the cutout on the earth side - that is, between the battery and your earth connection at the chassis.
That way, when it is turned off, everything is dead and no short circuit to earth can cause a problem.
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04-14-2020, 07:02 PM | #3 |
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Re: model a battery disconnect question
I agree with Synchro909 the ground cable should have the switch in line. I mounted my switch between the front seats on my 29 Tudor. Very easy to turn the switch on or off.
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04-14-2020, 10:43 PM | #4 |
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Re: model a battery disconnect question
In my Tudor, it is mounted on the cross member between the seats. To turn it on or off, I just poke my finger through a slot in the carpet. It's nearly invisible.
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04-15-2020, 05:44 AM | #5 |
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Re: model a battery disconnect question
This is where the switch is in my Coupe:
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04-15-2020, 09:09 AM | #6 |
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Re: model a battery disconnect question
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Bob Bidonde |
04-15-2020, 11:08 AM | #7 | |
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Re: model a battery disconnect question
Quote:
Not sure I understand, if the ground battery post is disconnected by the switch, how can there be any current flow? |
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04-15-2020, 11:27 AM | #8 | |
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Re: model a battery disconnect question
Quote:
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04-16-2020, 08:55 AM | #9 |
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Re: model a battery disconnect question
Good points guys. I stand corrected.
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04-16-2020, 09:26 AM | #10 |
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Re: model a battery disconnect question
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04-18-2020, 06:20 AM | #11 |
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Re: model a battery disconnect question
I prefer interrupting the ground side of the battery, + side, for several reasons.
It's generally easier to deal with the ground cable to chassis. Also if you interrupt the hot side of the battery and the disconnect switch shorts to ground you have instant full blown short. Had a couple of farm tractors do that. Thats how i know. Always buy a heavy duty disconnect switch. Lots of Amps flowing through that switch when starter is engaged. Lastly, when you put the disconnect on the hot side, your creating two more connection points in an area that is prone to water and road debris (more shorts). |
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