Battery Kill Switch Installation Question - Fiat 124 Spider Forum
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post #1 of 19 (permalink) Old 03-16-2019, 07:34 PM Thread Starter
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Battery Kill Switch Installation Question

Has anyone installed a battery kill switch under the hood?

Given that a lot of what we do with our vehicles involves disconnecting the battery before we begin work on things, and for those who winter their vehicles in a garage for months at a time, it seems like this might be a really good project to do. The problem is, I have no idea where to begin, or what might be best. I see many of them have amperage ratings. Do you need to match the cranking amps of the battery for this purpose, or am I off on a tangent?

What I'm thinking of is something that might be bolted to the side of the engine bay near the battery, with a nice "red" turn key. Turn it one direction, you have a live battery circuit. Turn it the other way, and you break the circuit. In general terms, that's what I'm contemplating. Finding that, mmmm, not so much luck so far....

I looked on Amazon, and I also paid a visit to Canadian Tire earlier today. CT has a switch that is purely mechanical. You remove the negative contact, and bolt it onto this copper flange, and then you place that flange over the negative battery post and tighten it down. To kill the battery, you loosen the connection. I'm not too keen on that as it seems to me like there's still the change of a connection being made and the circuit going live. Here are a couple of links to Amazon that show what I'm talking about.

This first one is like the one I saw in CT that I'm not so keen on. It also looks a bit butt ugly as well (IMHO)
https://www.amazon.com/Battery-Termi...ateway&sr=8-10

This is one possible choice:
https://www.amazon.com/Zoostliss-Bat...gateway&sr=8-8

And this is the one I really like the looks of. I think it's intended for a dash installation, but I'm still thinking under the hood near the battery...
https://www.amazon.com/QuickCar-Raci...ateway&sr=8-14

Anyone with experience in this or recommendation, please chime in with your thoughts and links to any products that might fit the bill.

TIA
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post #2 of 19 (permalink) Old 03-16-2019, 08:03 PM
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Cal,

I had that first one on my dune buggy and was very pleased with it's performance. No mounting necessary, but I'm not sure if the harness with the sensor module will adapt to the end of the unit (and I agree, it goes against the professional under-the-hood appearance).
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Last edited by ameridan; 03-16-2019 at 09:06 PM. Reason: scrubbed my idea to use it on the positive post.
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post #3 of 19 (permalink) Old 03-16-2019, 09:31 PM
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Cal, on my fiat 128, I had put a switch on the electric punp, which I had installed under the driver seat. So if car was stolen the thief would have done a couple hundred yards and car would stall. It was my first car, then who in then world would steal a fiat 128. LMAO
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post #4 of 19 (permalink) Old 03-17-2019, 08:49 AM
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Cal,

A Marine manual battery switch is what you are looking for I think.

Yes, you have to match intermittent and continuous draw amperage ratings.

Have a look at:

https://www.bluesea.com/products/cat...ttery_Switches

https://www.westmarine.com/battery-s...-_-Switch-_-NA

Size is probably a limiting factor.
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post #5 of 19 (permalink) Old 03-17-2019, 08:54 AM
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Something like this perhaps?

https://www.bluesea.com/products/600...__Knob_-_Black

Be advised that you will have to use heavy gauge wiring - I would source welding cable from Princess Auto along with the necessary lugs which you can crimp on with a hammer and chisel or a vice/press if you don't have the proper crimpers. Some large shrink tubing can help with a finished appearance.
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post #6 of 19 (permalink) Old 03-17-2019, 10:09 AM
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Like this?
https://www.delcity.net/store/Master..._4872.h_106787
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post #7 of 19 (permalink) Old 03-17-2019, 10:11 AM
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Harbor Freight:
https://www.harborfreight.com/batter...tch-97853.html

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post #8 of 19 (permalink) Old 03-17-2019, 05:01 PM Thread Starter
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Quote:
Originally Posted by BillaVista View Post
Something like this perhaps?

https://www.bluesea.com/products/600...__Knob_-_Black

Be advised that you will have to use heavy gauge wiring - I would source welding cable from Princess Auto along with the necessary lugs which you can crimp on with a hammer and chisel or a vice/press if you don't have the proper crimpers. Some large shrink tubing can help with a finished appearance.
Thank you. I see from the site that they have a red version of this as well... the SKU number just adds a 200 after the base number for the black variant (I think).

Good plan re: Princess Auto...I've got one literally five minutes from where I live.

I don't have an industrial crimper, but hammers and chisels I got. lol Joking aside, I could also likely use a nut splitter to do that as well, so long as I'm careful not to cut through it. Now I just have to figure out where to mount it.... and how to mount it. I was thinking drilling a couple of holes and using self tapping thread inserts along with a metal plate to hold it all in place. I've got to take some measurements and see how best to make this fit.

In it's basic form, I'm just installing this in-line in the positive cable for the battery, correct? And does it also need to be grounded, or should the switch be electrically isolated?

Quote:
Originally Posted by 8171 View Post
Yes, this is similar to one of the ones I looked at on Amazon. I liked the looks of it, and it seems pretty basic... the concern is that it's nearly 5" high (without the key). May still be an option.

Quote:
Originally Posted by 8171 View Post
This is the type I found at Canadian Tire... aside from aesthetics, I'm not overly keen on the way it's designed. I'm unsure if I would trust it 100%, but also understand that's based on my own personal ignorance. I was told you just crank the knob tight to enable the circuit, and slack it off to disable it. That didn't sound very good to me, for if it's just relying on a loose fitting to disconnect the circuit, would something as simple as a minor jar or shake create a temporary bridge? That bit is what worries me.


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Cravenspeed Shift Knob,;Stubby Antenna; Tach Pod Mount, Door Bushings
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post #9 of 19 (permalink) Old 03-17-2019, 05:23 PM Thread Starter
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Okay, I'm shocked. Billavista, you weren't joking when you talked about size being the limiting factor. This thing is much larger than I envisioned... nearly 4" square by 6" deep. Wow. Yup, I need to see where/how I can fit this in.


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EuroCompulsion Intercooler ; V4 Intake System; Catch Can, Phase I & II Tune
Cravenspeed Shift Knob,;Stubby Antenna; Tach Pod Mount, Door Bushings
PTP Turbo Blanket ; Forge BOP; GFB DV+ ; Defi Tach; Hood Lift Kit
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post #10 of 19 (permalink) Old 03-17-2019, 05:38 PM
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Best to install it on the negative side. That way you completely isolate the battery and electrical system.

If you put it on the positive side, if you were to drop a wrench and bridge the pos and neg terminals of the battery you'd have a major short.

I have seen smaller ones, but it may take some hunting.

Installation is simple - you wire it in series...it literally just makes or breaks the ground circuit.

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