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10-11-2017, 10:47 PM | #1 |
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Join Date: Mar 2013
Location: Ft.Mill, south carolina
Posts: 52
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Battery disconnect switch- on positive or negative
I purchased my 1928 Tudor 5 years ago. At the time the previous owner had the disconnect switch on the positive post of the battery. The cable then went to the frame. The negative is directly connected to the starter. It has been fine. But I have recently read that the disconnect switch should be on the negative side. Does it make a difference?
Thanks for your advice. REB |
10-11-2017, 10:59 PM | #2 |
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Join Date: Jun 2017
Location: Walla Walla, WA
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Re: Battery disconnect switch- on positive or negative
Electrically, I don't think it matters much. The question of which side to switch might matter more if the switch is located under the seat or floorboard or in the engine compartment near the starter. Mine is in the engine compartment near the starter so it is a more natural fit to do the negative side. Negative is also considered to be the "hot" side so that is kind of what I would consider preferable. However, if the switch is such that wiring it is more conducive for a switched positive, you kind of have to wire it where the cables fit and are not excessively long, and where they can be "dressed" nicely.
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10-11-2017, 11:25 PM | #3 |
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Join Date: Mar 2013
Location: Ft.Mill, south carolina
Posts: 52
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Re: Battery disconnect switch- on positive or negative
My battery disconnect switch is attached to the battery under the floor board.
REB |
10-11-2017, 11:47 PM | #4 |
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Location: Auburn Washington
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Re: Battery disconnect switch- on positive or negative
it does not matters which side you put the disconnect on. I like it on the positive side that ground to the frame, if you are running more wires to the switch, if they short out it is no big deal. on the other side if it shorts out it is a BIG deal.
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10-12-2017, 12:04 AM | #5 |
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Re: Battery disconnect switch- on positive or negative
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10-12-2017, 12:32 AM | #6 |
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Re: Battery disconnect switch- on positive or negative
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10-12-2017, 12:59 AM | #7 |
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Re: Battery disconnect switch- on positive or negative
Yes, the ground side is the best side.
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10-12-2017, 08:07 AM | #8 |
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Re: Battery disconnect switch- on positive or negative
Yup - same logic behind when your removing a battery - start at the ground terminal and end with the ground terminal.
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10-12-2017, 10:26 AM | #9 |
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Re: Battery disconnect switch- on positive or negative
The switch is easier to install into the battery's output cable to the starter.
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Bob Bidonde |
10-12-2017, 08:29 PM | #10 |
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Location: Adelaide Australia
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Re: Battery disconnect switch- on positive or negative
Always place a battery disconnect on the ground side regardless of polarity of the vehicle. ie for a positive ground or earth, put the switch on the positive cable. Also, when disconnecting a battery always disconnect the ground/earth first. This is because the whole frame/chassis/body of the vehicle is the ground or earth of the whole vehicle, and by disconnecting the ground you avoid shorting out tools etc while working on the system or moving the battery in and out.
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10-13-2017, 02:52 PM | #11 |
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Location: Mansfield, Ohio
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Re: Battery disconnect switch- on positive or negative
Where is the best place to mount this switch where you could get to it easy? Does anybody ever mount it in the floor board somewhere where you can reach down and shut it off while in the car.
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10-13-2017, 03:31 PM | #12 |
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Re: Battery disconnect switch- on positive or negative
thats where most ive seen are mounted - or seat riser depending on model.
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