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Old 09-01-2019, 12:11 PM   #1 (permalink)
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skool me on automatic battery disconnects

who has em on their vehicle, and which ones do you like/not like?

looking for something that will automatically disconnect the battery when it gets low.
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Old 09-01-2019, 12:14 PM   #2 (permalink)
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Why?
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Old 09-01-2019, 12:27 PM   #3 (permalink)
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Why?
got a daily driver , either a 77 K10 or a 65 Falcon that sits at a truck terminal for 4 to 10 days at a time
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Old 09-01-2019, 12:27 PM   #4 (permalink)
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who has em on their vehicle, and which ones do you like/not like?

looking for something that will automatically disconnect the battery when it gets low.
you'lll have to school me. whats the point of disconnecting it if its already low?
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Old 09-01-2019, 12:33 PM   #5 (permalink)
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you'lll have to school me. whats the point of disconnecting it if its already low?
one place i worked at had em on their bus, if it dropped below 11 volts it disconnected the battery so it couldnt get too drained to crank the engine
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Old 09-01-2019, 12:39 PM   #6 (permalink)
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If you have a battery that is going dead in 4 or 10 days adding a device like this is going to add more load to it. A properly functioning vehicle should be able to sit 30+ days without any problems starting.
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Old 09-01-2019, 12:44 PM   #7 (permalink)
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I've installed a handful of these for people on boats. Work well and adjustable from 11.3 to 12.1 for cut off.

https://www.bluesea.com/products/763...age_Disconnect
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Old 09-01-2019, 12:59 PM   #8 (permalink)
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https://www.summitracing.com/parts/rfw-ms11/overview/

https://www.summitracing.com/parts/sms-t3-12v/overview/

something like this is what im looking for real world users.
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Old 09-01-2019, 01:03 PM   #9 (permalink)
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Get a battery tender, had one on a car that I mostly kept in the garage , worked every time.
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Old 09-01-2019, 01:31 PM   #10 (permalink)
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I like the idea of the automatic battery cutoff. Never heard of that before.

But if you know the vehicle is going to be sitting for long enough to possibly drain it, why not just disconnect one cable? Or if the battery is difficult to get to, install a cutoff switch. I've got a big cutoff switch on a few of my vehicles for this reason, they don't get driven all the time.
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Old 09-01-2019, 01:50 PM   #11 (permalink)
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If you have a battery that is going dead in 4 or 10 days adding a device like this is going to add more load to it. A properly functioning vehicle should be able to sit 30+ days without any problems starting.
Yes. I had a shit box that got started every 5 or 6 months. Never had any problems.
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Old 09-01-2019, 02:02 PM   #12 (permalink)
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I would think that a set of Anderson connectors, disconnected when you leave the vehicle, reconnected when you come back to it would be a hell of a lot cheaper. Failsafe and damn near unfuckupable. Just my .02
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Old 09-01-2019, 02:24 PM   #13 (permalink)
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got a daily driver , either a 77 K10 or a 65 Falcon that sits at a truck terminal for 4 to 10 days at a time
put a toggle switch on the radio's power

ain't anything else on them that'll kill the battery
unless you've got some EFI stuff going on, in that case make sure you're putting switched power to the right inputs
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Old 09-01-2019, 04:14 PM   #14 (permalink)
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Quote:
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one place i worked at had em on their bus, if it dropped below 11 volts it disconnected the battery so it couldnt get too drained to crank the engine
11 volt battery is already fucked, and beyond "cranking ability"

12.5 is "dead" and 12.0 is nearly fucked. 11 is really fucked.

+whatever on maintainers (I like NOCO)

and

+whatever on a disconnecting means.
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Old 09-01-2019, 04:22 PM   #15 (permalink)
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Put one of the little solar maintainers on it and not worry about killing the battery all the time.
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Old 09-01-2019, 04:29 PM   #16 (permalink)
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I would say just get a manual one. Simple and nothing to fail
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Old 09-01-2019, 08:18 PM   #17 (permalink)
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Quote:
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Quote:
Originally Posted by roundhouse View Post
got a daily driver , either a 77 K10 or a 65 Falcon that sits at a truck terminal for 4 to 10 days at a time
put a toggle switch on the radio's power

ain't anything else on them that'll kill the battery
unless you've got some EFI stuff going on, in that case make sure you're putting switched power to the right inputs
Radio power draining battery? My 85 K10 will kill a battery if it sits for any length of time. I just unhook the negative batt cable every time I park it. And I literally drive it like 10 times a year maybe. I figured the damn clock in the dash drains the battery because it makes all kinds of noise running/ticking away.
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Old 09-01-2019, 08:23 PM   #18 (permalink)
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Pics of the Falcon? It was my first car
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Old 09-01-2019, 08:30 PM   #19 (permalink)
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Quote:
Originally Posted by [486] View Post
put a toggle switch on the radio's power

ain't anything else on them that'll kill the battery
unless you've got some EFI stuff going on, in that case make sure you're putting switched power to the right inputs
A 1 wire alternator can also drain the battery if it is fucked up, or that's been my experience. I've started wiring them into a big constant duty solenoid, so that when the key is off it kills power going to the alternator as well...
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Old 09-02-2019, 06:08 AM   #20 (permalink)
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My 2000 Dodge pickup had one, had to get under the hood to re set the red button. I was always leaving my headlights on
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Old 09-02-2019, 06:29 AM   #21 (permalink)
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I had one 100 years ago on a full size blazer, back when us youngins would hang around outdoors with kegs listening to tunes. Worked awesome, would shut down with just enough juice to crank engine.

In your situation, I think I would be more interested in figuring out what's draining my juice in such a short period of time.
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Old 09-02-2019, 08:50 AM   #22 (permalink)
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A 1 wire alternator can also drain the battery if it is fucked up, or that's been my experience. I've started wiring them into a big constant duty solenoid, so that when the key is off it kills power going to the alternator as well...
ehhh just take the time to wire up the extra two wires
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Old 09-02-2019, 09:08 AM   #23 (permalink)
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Get a battery tender, had one on a car that I mostly kept in the garage , worked every time.


That works if you park it in a garage
I have six cars and one carport
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Old 09-02-2019, 09:09 AM   #24 (permalink)
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Put one of the little solar maintainers on it and not worry about killing the battery all the time.


I have a solar maintainer on my lawnmower
I use the mower two or three times a summer and before I put the solar panel on it , the battery was always dead
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Old 09-02-2019, 09:10 AM   #25 (permalink)
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Pics of the Falcon? It was my first car


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