Mysterious Yellow Wire

[JayP]

HI, I'm trying to identify a yellow wire that passes through the firewall above the passenger side footwell. It has an in-line fuse on the side inside the car. There was a previous post (https://www.sl113.org/forums/index.php?topic=17749.0) with someone asking the same question about the same wire but no one identified it, so I'm asking again with the hope that someone might know. Thanks!

[BobH]

Hello, it isn't shown on the wiring schematics, and the fact it has an inline fuse would indicate it's been installed later, perhaps by a dealer

Have a look on here, seems Blaupunkt radios used a yellow power wire with inline fuse

https://www.sl113.org/forums/index.php?topic=2223.msg11714#msg11714

[JayP]

Thanks very much for replying. I do have an old Becker radio but it's working fine without that wire. Also that wire travels through the firewall and forward into a wire bundle, not to a fuse box. Still stumped. I will test it to see if it's live.

[clunker]

Was there a/c previously installed? this wire may have come from the under dash a/c unit to control the compressor clutch.

[JayP]

Yes. According to the data card there was once a/c, although it's been without it for the 20 years I've owned the car so I forgot. That makes sense. Thank you.