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Author Topic: Main Switch  (Read 7172 times)

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Offline fabr

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Main Switch
« on: October 26, 2009, 08:46:34 AM »
OK ,this was discussed before  but, what,if any, negatives are there to placing the main battery cutoff in the negative battery cable. I was swayed by our Aussie members that that is a better place for it than in the positive cable.  Is there ANY reason to NOT put it in the negative cable other than sanctioning bodies here in the U.S. want it in the positive?
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Offline Reidy02

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Re: Main Switch
« Reply #1 on: October 26, 2009, 06:05:25 PM »
I'm not too sure Master but I think it has to do with the computer, I'm sure someone will jump in any moment and tell how wrong I am but that's something I  sorta remember, I think, but my memory isn't what it use to be... ::) Too many blows to the head. :-\ 5:
« Last Edit: October 26, 2009, 06:09:48 PM by Reidy02 »
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Offline Yummi

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Re: Main Switch
« Reply #2 on: October 26, 2009, 07:21:33 PM »
If you do your toilet will flow anti-clockwise.  (Backwards.)
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Offline fabr

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Re: Main Switch
« Reply #3 on: October 26, 2009, 07:24:05 PM »
Maybe so for memory? Needs + always available?
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Offline Boostinjdm

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Re: Main Switch
« Reply #4 on: October 26, 2009, 08:42:20 PM »
Quote from: Masterfabr on October 26, 2009, 07:24:05 PM
Maybe so for memory? Needs + always available?

Ya also need - for the + to work for memory.  Try going out to your truck and unhooking the -.  See if your radio and clock keep thier settings...
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Offline fabr

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Re: Main Switch
« Reply #5 on: October 26, 2009, 08:57:01 PM »
I know and understand what you're saying .I don't think it is a problem with the bike motor cars but those of us running data loggers like Innovate DL-32's I think you have a good point on why not to do a negative main switch.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Offline Boostinjdm

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Re: Main Switch
« Reply #6 on: October 26, 2009, 11:56:17 PM »
I believe the reason you are supposed to disconnect the neg first when removing a battery, is so if your wrench slips and hits the frame or something it won't arc.  When it comes to main disconnect switches, I don't think it makes a damn bit of difference which wire you kill as long as it is as close to the battery as possible.  As for the Datalogger, you might consider a standalone power supply to run it that is charged up by the vehicles charging system, but continues to supply power to the datalogger alone if the batt is disconnected.  A small nicad pack or something similar would provide hours or days of backup power.

I kinda see it like the extra battery I install in trailers.  They are tied to my pickup through a relay that is triggered by the switched ignition power.  That way, the batt in the trailer is being charged when the truck is running, but when the key is off, it is it's own separate system.  In my gokart trailer, this allows me to use the interior lights even when it is not hooked up to the truck.  With my dump trailer, I will have the same type of deal allowing me to run the winch or hydraulic pump with or without the truck attached.  It also means that I don't have to run big bulky wires from the pickup to the trailer.  Charging is done via a 12awg wire in the plug.
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chrishallett83

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Re: Main Switch
« Reply #7 on: October 27, 2009, 06:23:59 PM »
If I had any idea where they got them from, I'd link you to a very nice battery isolator switch that my old work fitted to a bunch of trucks we sold to somebody the oil/gas industry.

They cut off both sides of the circuit, were sealed up good enough to be able to use a steam pressure cleaner on them, were rated to something like 1000 amps constant draw at 24 volts, and were also hooked up to an impact/rollover switch, so if the truck was in a significant impact or if it fell on its side, the battery circuit would be shut off automatically.
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Offline fabr

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Re: Main Switch
« Reply #8 on: October 27, 2009, 07:48:23 PM »
Bet they're pricey too.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

chrishallett83

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Re: Main Switch
« Reply #9 on: October 29, 2009, 06:37:56 PM »
Yeah they were a couple hundred bucks each from memory.

Real nice units though!
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Offline fabr

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Re: Main Switch
« Reply #10 on: October 29, 2009, 07:08:31 PM »
I bet but since a busa only makes approx. 33 amps max it might be a bit overkill both in cost and maybe size.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Jet

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Re: Main Switch
« Reply #11 on: October 29, 2009, 08:55:03 PM »
I Haven't Read the whole argument, but didn't anybody point out that current flows from negitive to positive?
Just put it on the negitive! LMAO
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Offline fabr

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Re: Main Switch
« Reply #12 on: October 29, 2009, 09:10:11 PM »
It may well do so but i admit i don't understand that. You guys need to do some splaining as I was not taught that but I may have had a mistaken teacher. Enlighten me. I remember this coming up before but I didn't understand it then either.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Offline Boostinjdm

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Re: Main Switch
« Reply #13 on: October 29, 2009, 09:24:16 PM »
Yes, electrons flow from negative to positive, but you have to have both for them to flow at all.  Also the way circuits are wired makes a difference as the positive is usually the switched side of the circuit.
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Offline Nutz4sand

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Re: Main Switch
« Reply #14 on: October 30, 2009, 02:07:54 AM »
I dunno if they still make it but they USED to make a battery with a remote control pendant. The battery would literally cut the juice itself yet still send enough power for radios clocks and the ecu's that needed it but not enough power to start the car.

They may still make them? Not sure if it would accomplish what you wish either.  Call the local battery shop and ask.
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