[BigFatGuy]

I've looked at the fuse box documentation, and I don't find anything that sounds like it might feed these circuits...

Under my Driver's and Passenger's seat, there is a 2-wire connector. The original seats had power lumbar, so this must have powered them.

Apparently, though, the Bronco had an option for a full-power seat, with power lift/tilt/etc...

I'm thinking, it's likely this circuit is, then, strong enough to power that full-power seat and not just a lumbar air pump.

So, anyone know the capacity of this circuit? I'm hoping it's enough to power a seat-heater...

 

[MS88Bronc]

I installed a set of front buckets from a 2008 F-250 supercab in my wife’s bronco, and the drivers seat is full 6-way power. I used the power lumbar pigtail to power this feature. I don’t think I would trust it to run a seat heater though. If it were me, I’d run a dedicated fused circuit for that - determine wire gauge based on amp draw of the heater.

 

[BigFatGuy]

That's kind of why I'm asking.
I figure there's likely a fusible link in the circuit already.

 

[miesk5]

Yo Big,

 

[BigFatGuy]

so, if I'm reading this right, the same circuit powers both lumbar motors AND the power door locks... not a good place to tap power for a pair of heaters...

Thanks!

 

[miesk5]

Yo,
C305 Under LH side of LH front seat, to left power lumbar switch (F8) Terminal: 02 Color: GY
C306 Under RH side of RH front seat, to right power lumbar switch (D1) Terminal: 02 Color: GY

C312 Under front of LH seat, on left power lumbar compressor motor (F6) Terminal: 02 Color: BK
C313 Below LH front seat (C9) Terminal: 02 Color: GY

C314 Below RH front seat (A3) Terminal: 02 Color: GY

C317 Under front of RH front seat, on right power lumbar compressor motor (F3) Terminal: 02 Color: BK

C302 Below RH side of LH front seat, to seat belt switch (A3) Terminal: 02 Color: GY

C313 Below LH front seat (C9) Terminal: 02 Color: GY

C314 Below RH front seat (A3) Terminal: 02 Color: GY

 

[Stitch's 95]

I agree with @MS88Bronc, I would not trust it to run a heater. From an electrical standpoint, the seat motors may draw more current, but it would be for a very short period of time, not allowing the wires to get hot. Also, only one if the motors would be typically be drawing current at a time, hence the smaller wires providing power to multiple functions.

A seat heater would draw current continously, allowing much more heat to build up in the wires. You could check the current draw on the heater to be sure, but I suspect it would overload the wires, the instant that you tried to use one of the other functions.

Sent from my SM-N950U using Tapatalk

 

[Mustang_Bronco]

Yo Big,
(....)

So if I'm reading this right, the seat motors are fused at 50a out of the power distribution box. Assuming my truck is not wired for a power seat, and I'm pulling a wire from that position into the seat, I'll just size the wire appropriately and slave the seat heater off the same circuit.

 

[BigFatGuy]

50A in the circuit to power the motorized chairs. 25 in the lumbar-only chairs.

Once I'm running wire, I may as well do it right. I was hoping to tap off on the existing wire under the chairs.

 

[Mustang_Bronco]

50A in the circuit to power the motorized chairs. 25 in the lumbar-only chairs.

Once I'm running wire, I may as well do it right. I was hoping to tap off on the existing wire under the chairs.

My 94xl only has the seat belt warning wiring, there's absolutely nothing else there. Pulling a #10 and slapping it on a 50, then adding my 7.5a fused heater to the harness in the seat shouldn't hurt anything

 

[miesk5]

So if I'm reading this right, the seat motors are fused at 50a out of the power distribution box. Assuming my truck is not wired for a power seat, and I'm pulling a wire from that position into the seat, I'll just size the wire appropriately and slave the seat heater off the same circuit.

Yo,
In the 1996 Bronco/F Series Workshop Manual, partial @ http://www.diesel-dave.com/vehic/manual/stj/stj1a001.htm#extract_178
"Circuit Protection
The power seat circuit is protected by a high current fuse located in the power distribution box"

However;
In this 96 EVTM, provided by member Roadkill;

Fuse 6 is shown as just 10 amps and is just for Trailer RH STOP Turn Lamp.
》Look at your 96 Power Distribution Box Legend.
●
NO SEAT MOTOR is cited in this 96 Bronco Fuse Panel;
Diagram

;