second battery, 1986 cadillac deville

I basically have a 1986 cadillac deville sedan and I want to rewire all my extra copenets to the second battery. For example tvs etc. These tvs are running on a 12 volt connection how do I lower the voltage on the battery to power these tvs safely. I was told I must create a fuse box for the second battery came this be done or which is the best way for it. Thanks for all your help

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1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"

The second battery will be charging from the alternator just like the first one so it will be 12 volts. You will want to fuse the cable on both ends that runs between the batteries. Also you will want to install a battery isolator between them to keep your starting battery from dying.

I think you misunderstood my question. I was pertaining to the fuse box that's in the interior. I would like one for the second battery... for instance if I was wiring a 12 volt device to the second battery can I wire it directly to the battery and ground it or what is the correct way to connect the 12 volt device to the battery thanks again

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1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"

I have a1986 cadillac deville and I was wondering how to add a second fuse box for my aftermarket devices. I will need a set of 4 fuses at a 30 amp fuse rating. The second fuse box will be wired to the second battery which will have a isoloator/relay between the primary battery and second 1. But the issue is when the car is off the aftermarkert devices will be connected to the second battery and that will drain it. So how do I control it so where they turn on when the car is in accessory mode. Also I have a cigarette charger device which lead is postive and negitive on the male part of the cig charger thanks

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1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"

You will need a big relay (or solenoid, as they are usually called when they get that big.  4 30A devices would total 120A so I would look for a device rated at 120A or higher.  You will then need to control the coil off of your OEM ignition.  The solenoid will isolate the 2nd fuse box from the 2nd battery when the cars ignition is off.

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Kevin Pierson

Something like this: https://www.delcity.net/delcity/servlet/catalog?parentid=790167&page=1

You could also technically use a 30A relay for each fuse, but that will get a little messy (space and wiring wise).

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Kevin Pierson

thanks for your help but the four of them are on a 30 total  another on a 30 and two other on cig chargers so that should be 90 can i use the same solienod or does it matter do you know where i can find a fuse box  for a car and how do i wire it to the battery

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1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"

Take a look around the Delcity.net site, they have everything you would need.

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Kevin Pierson

thanks one more question since im adding a second fuse box  how do i wire a fuse box to the second battey since i cant wire these  30a devices directly to the battery. i found a fuse box for a simliar model car as mine  would this work or do i have to use a box from scratch.i was told resistors work what  would be the best method to wire from the battery to the box safely

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1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"

You just wire it directly to the battery, through the isolation solenoid.  The fuse box should have a power wire or bus that needs to be connected directly to a power source.  You should fuse the power wire within 12-18" of the battery.  No resistors are needed.

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Kevin Pierson

Okay I'm understanding what your talking about but when the car is in accesory mode the 2nd battery is in 12v but when you turn the car completely on its in 243 won't that damage my 12 volt devices . The batteries are wired in a pararell config.

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1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"

If the batteries are wired in parallel you'll only have 12vdc at all time from them both (however you will have twice the availible current, and twice the load on the alt).  Even if they were in series they still wouldn't read 24vdc unless you had an upgraded alternator that had the ability to charge them at 24vdc.

It really sounds like you should seek the help of a professional installer to guide you through this.  If you hook something up wrong it could cause a fire that could quickly destroy your Caddy!

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Kevin Pierson

Thanks for all your help and concern. I wired radios before in car but I never had to deal with relays and upgrading charging systems and modifying so many wiring systems and using solenoids. The systems I've installed before didn't require so much power that a second battery is required. I'm aware that if u have a second battery your alternator will have to work twice as hard. Its to prevent a constant dead battery cause cadillac tend to use batteries a lot. If you want to get an idea on what I'm doing visit my website if you like. Thanks again for your help
https://www.cardomain.com/ride/2238122


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1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"