What does this wire do???
The wire was attached to the front of the horn relay.
The other 4 wires make sense.
What is this? The inside of it is broken.
Should I lenghthen the remaining peice thats still there and re-attach to the horn relay.
The wire is black with a yellow stripe.

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Looks like a fusible link to me.

 

Methinks it's the ground wire for the horn - goes through a hole in the core support!
Seems it needs a female spade connector, and some more wire!

 

It's the fuse holder for the blower high speed relay. It supplies 12v to the blower motor when high speed is selected and the resistors are bypassed.

These things were notoriously prone to failure and damn near impossible to open without destroying it. Unless you're going for 100% original appearance, get a heavy duty inline fuse holder and splice it in, in place of this thing. You can use a glass tube or blade type, 30A. Either works well.

Connect one end to the horn relay (properly called junction block) and the other to the cut yellow/black wire on the high blower relay plug, located on the firewall. Disconnect the battery- the post this wire goes to is hot at all times.

 

NO

The horn does not have a ground wire. Its grounded through the housing where its bolted to the core support.

Seriously, its a safety device called a fusible link. In burns up so your car doesn't half to burn down in a pile of flames. It functions like a fuse.

It needs to replaced with one rated exactly like it.

 

Thank-you all for the replies.
It's definatley a type of fuse and Rocketraider, I think you are on the money!
With it disconnected the rest of the car works fine.
I haven't got to install the under dash components yet, so although I didn't confirm it yet I'm confident I'm on the right path.
I'm aweful glad to have the answer ahead of time.. Thanks!(The check is in the mail )

 

What he said.

 

High speed blower fuseholder.
When splicing in a new one, SOLDER all connections and insulate with a couple layers of heat shrink tubing. The common aftermarket crimp connections are not suitable for high current or stressful environments like under the hood.
The metal crimp termanals may be used, only if the wires are soldered well after mild crimping (solder flows throughout). use heat shrink tubing in place of the colored plastic insulators for neatness and weather resistance.

 

if using crimp connectors ,aka butt connectors, get the type with out the plastic insulation they are made from heaver material and make a stronger connection,plus heat shrink will slide over them.