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Old 04-20-2013, 12:32 AM   #1
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12v seat heater wiring question..

I'm not an expert on wiring, I think what I want to do will be fine but I wanted to ask here to see if I am missing something.

I have new seats with seat heaters for the front that I am installing tomorrow.
The heaters are two wire to each seat, hot and ground. They both run off their own wires and switches, and they both come with inline fuses 7.5a fuses.

My situation is this: I previously ran a bundle of 5 wires from behind the battery through a grommet & split loom through the firewall to behind the glovebox where the fuse panel is. These wires are to be used to run 12v accessories off the battery.

My question is: If I use an inline fuse on ONE of these wires at the battery (say a 15a fuse), can I use that same one wire to split off and run BOTH the hot leads for both heated seats with their 7.5a inline fuses.

In other words, can one fused wire from the battery run both fused wires for the heated seats? Or do I have to run individual hot leads from the battery for each seat?

I'd much rather use one of my accessory wires to run both seats then two.

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Old 04-20-2013, 12:48 AM   #2
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Hi, yes you can as long as the cable is rated for the higher current. I you are adding a few accessories you might be better off getting a small fuse board that you could mount somewhere. You would then be treating the supply cable as a sub main. Only drawback would be if you overloaded the sub main and popped the fuse all your accessories would go out.

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Old 04-20-2013, 12:55 AM   #3
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You should be fine as long as the wire from the 15a fuse is big enough to carry the potential 15a load. Then of course you still need the 7.5a fuses to each seat at the junction where they branch from the single wire. Wire size depends on load (amps), voltage, length of the wire (distance) & allowable voltage drop. Do a search for the ampacity of wire be sure it is for 12v.

I think this one has what you need.

Ampacities for wire
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Old 04-20-2013, 01:20 AM   #4
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The reasoning for the above is, if your hot wire touches ground, you want it to carry enough current to pop the fuse. If it doesn't carry enough current to pop the fuse, FIRE!
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