While reassembling my '68 XR-7, I found this brown wire behind the glove box.
I scoured my wiring diagram and the nearest I can figure, this is for the non-existent (in my car) rear defrost.
Anyone have any other ideas as to where this might go?
I scoured my wiring diagram and the nearest I can figure, this is for the non-existent (in my car) rear defrost.
Let it be. All 68 tach Mustangs and Cougars have this wire, regardless of rear defrost.
I figured. Thanks Midlife!
Rear defog is a triangle shaped plug. If I remember correctly it’s kind of an orangy red color.
I think the PO cut the plug off and covered the end with some sort of rubbery goop.
Can I use that wire to turn on an amp?
Probably not; it has a buried resistor wire embedded in its circuitry.
Ahh. Bummer. Oh well. Thanks Midlife.
That is an interesting idea! You could use the wire to feed a power amp if you use a switch (or jumper) to connect the 257 (yellow) power wire to the 186 (brown) direct feed wire. The 260 (red/black) wire has a 23 ohm resistor top operate the defogger motor on the slow speed.
Recognize that these are only 18 gauge wires, so limit the current drawn to under 5 Amps.
I don’t want to power the amp with that wire, just use it to turn the amp on. I would run a dedicated fused power line from the battery to power it.
You may very well use that wire for an relay input.
Not sure what your running for a head unit but newer 80’s up usually have a blue or purple wire on them which is designed to power up amps/power antennas when the head unit is turned on. “Power up” meaning signal to relay in the amp to close the 12V battery power circuit which powers the amp.