Battery isolator switch

dag019 · Jun 26, 2020

I am currently looking for a battery isolator switch. What I really want is one of the lucas battery post switches like I have on one of my tractors however these no longer seem to be available and the prices of the ones I have seen are far to high. I am looking for an on off switch rather than the screw connector switches found on ebay. I have come across this one that is the sort of thing I am looking for (Link), however can any one confirm if the rating is high enough for a standard series 3 2.25 diesel?

Maximum Voltage - 32v
Continuous Rating - 150A
Intermittent Rating 225A
Cranking Rating 30 Sec - 450A

Mark Frewin · Jun 26, 2020

That's a neat item, l would think that 450amps would be suitable. If you google Lucas M45G starter relays are mentioned at 500amps though.

rob1miles · Jun 26, 2020

I see its out of stock. One way is to match the switch to the battery CCA for the 30 sec / cranking rating since you know this is the max it will see.

TheMegaMan · Jun 26, 2020

I was just thinking the other day that that there are quite a few unfused cables, and I'd like to have a pretty quick way to isolate the battery in case I smell hot insulation. That's a neat switch - a lot better than some of the isolators I've seen.

Shippers · Jun 26, 2020

Have you checked carbuilder solutions...I got mine from there acts as security as well....

wireman · Jun 27, 2020

dag019 said:
I am currently looking for a battery isolator switch. What I really want is one of the lucas battery post switches like I have on one of my tractors however these no longer seem to be available and the prices of the ones I have seen are far to high. I am looking for an on off switch rather than the screw connector switches found on ebay. I have come across this one that is the sort of thing I am looking for (Link), however can any one confirm if the rating is high enough for a standard series 3 2.25 diesel?

Maximum Voltage - 32

Continuous Rating - 150A

Intermittent Rating 225A

Cranking Rating 30 Sec - 450A

How about this one?

https://www.autosparks.co.uk/classi...-isolator-switch-complete-with-terminals.html

dag019 · Jun 27, 2020

wireman said:
How about this one?

https://www.autosparks.co.uk/classi...-isolator-switch-complete-with-terminals.html

That is all well and good but really I am looking for a terminal mount switch. I have one on the tractor that is an old Lucas item (Similar to this: link) and a modern version of that is what I am after really so that is do not need to worry about cabling and finding somewhere to mount the switch as it is all neatly contained at the battery terminal.

wireman · Jun 27, 2020

I see

rob1miles · Jun 27, 2020

I have one of those on my Series, but it doesn't switch the starter current, that's straight through, its wired to switch everything else so 50A is fine. You don't want any avoidable conenctions between the battery and the solenoid.

dag019 · Jun 28, 2020

How

rob1miles said:
I have one of those on my Series, but it doesn't switch the starter current, that's straight through, its wired to switch everything else so 50A is fine. You don't want any avoidable conenctions between the battery and the solenoid.

How do amps work if it is on earth side? Is there still the same rating required as for the positive draw? I am not great with calculating electrical things.

Shippers · Jun 28, 2020

rob1miles said:
I have one of those on my Series, but it doesn't switch the starter current, that's straight through, its wired to switch everything else so 50A is fine. You don't want any
avoidable conenctions between the battery and the solenoid.

I have the same a removable key isolater which kills all electrics but starter still direct from battery but have removed solenoid wire from ignition and wired it through a hidden start button also fuel pump is on a seperate switch alongside battery isolater...

Battery isolator switch

dag019

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Mark Frewin

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TheMegaMan

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Shippers

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wireman

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dag019

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dag019

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