79SC mystery wires in cabin what is this for?

[Robey5]

Hey all:

So - getting right down to business here, I have a couple wires that I came across that I do not know what to do with. Where were these intended to go originally?



The Brown/white stripe and blue/white stripe wires were just left behind under the carpet from what I can tell here. These are both sitting on the tunnel behind the parking brake. One of them looks like an old seat belt warning light wire, but I have no idea where these are supposed to go. Any comments from the forum???

[pors1968]

The brown and white hand brake swicth

[fred cook]

I think the blue and white should go to the heater indicator light that should sit just ahead of the heater levers.

[Robey5]

Hand brake switch:

Where does this wire actually connect?? I don't see any place where the wire goes, although the wire length seems to be logical.

The heater lever wires seem to be yellow, and both are connected.

[fred cook]

Originally Posted by Robey5

Hand brake switch:

Where does this wire actually connect?? I don't see any place where the wire goes, although the wire length seems to be logical.

The heater lever wires seem to be yellow, and both are connected.

But, what about the heater indicator light? It is about 1 1/2" square and sits just in front of the heater levers. See if the blue/white wire is hot when the levers are in the up position. If so, it should go to the light.

[pors1968]

You have to lift your hand brake assy .You can see the swith on top near end of lever it connect under.

[Jdub]

If the yellow wires are physically connected, I believe your heater blower motor should be operating when you turn on the ignition. There is a switch, just fore of the heater levers and under then, that opens and closes based on the operation of the levers. Pull up, connect, heater blower on, heated air forced in. Closed, connection broken, no blower, etc.

Are you able to read schematics? See here and note 108/109 for connection, relay, and blower motor on yellow wires.

So, how is your heater blower motor? Open the engine lid and note the condition of the wires to your blower. I wonder if they are melted or the motor seized. If I were you I would absolutely separate those wires until you vet the motor.

[Robey5]

Jdub: thank you for the schematic - yes, this confirms that we're dealing with the hand brake light switch, and the heater light with these two wires.

Thanks for the help thus far guys...

I will take another swing at straightening these wires out later, as I am expected to be somewhere later today.

Here's what I can 'confirm'

When I put the ignition to the "on" position and pull the levers, we have no movement from the blower motor. (with both of the yellow wires connected, but the blue stipe wire not connected). When I tested the blower motor (last summer, before I put the engine in the car) it worked fine. I will test it once more, but the wire terminals are not scorched, they look fine.

[Robey5]

Ok, so I found the hand brake wire connection (wow, that is in a tight hiding spot!!)

So, after I pulled the hand brake assy, I traced the wires up to the heater levers, and I still do not know where the longer wire (actually black with blue stripe, description was inaccurate before, sorry) actually connects.

There is a terminal in the heater switch area, is this where the black/blue stripe wire connects??



One step at a time, I suppose....

[Robey5]

I believe that the 2 (yellow) wires are connected to 911 613 525 00 "heating lever contact" - which is really tough to see in the picture. So, my question is: does the black/blue wire connect to this heating lever contact as well?

[Robey5]

Anyone have an idea on the location of the black/blue wire on the "heater lever contact"? I want to try to button this thing up tonight.

[tirwin]

I'm looking at a wiring diagram. There is a black wire with blue stripe that goes to the "heater control assembly light". It looks like it's on the same circuit as a bunch of other instrument lights.

[Algernon]

I think there are 3 pairs of un-related wires;
the blue/black (?) pair go to the heater lever light on the floor, and illuminate when dash lights come on.Must not be shorted together.
the yellow ones (?), when shorted together turn on the rear blower motor to give cabin heat,
the last pair when shorted together turn on the brake warning light on dash.
I'm not too sure of the colors, but wire position and length is good indicator.
Hope this helps.

[Robey5]

Ok:

Last night, I was able to test the blower motor in the "engine room" - by taking my battery and using a jumper to the wires on the fan.

The blower works, when 12V is applied to the motor, it operates as expected. No squeaks, no blocking points, it's good.

I then took a look at the fuses that are in the engine room (on the LH side) and confirmed that there were not any blown. I checked all of the fuses on the fuse panel (near the gas tank), and confirmed that there weren't any blown there either.

So, I proceeded to test the hand control switch (says 911.613.525.00 on it) by connecting the battery, and connecting the two yellow wires to the switch. I could hear a "clicking" sound when moving the contacts with my hand that would be operated by the levers. The fan will not run doing this "test".

I then checked continuity of the 911.613.525.00 switch with a multimeter - and one seems to work properly, and the other does not - and the contacts look pretty shot. To add insult to injury, I dropped one of the hand brake pins for the cable puller in the tunnel, and cannot find it. So -- an order will be placed with our host. for these parts.

Through all of this, I still do no know *where* the black/blue stripe wire connects to. I have confirmed that this wire is for the light, but do not know where it physically connects to - to complete the circuit. My searches have come up empty, does anyone have a picture of *where* this black/blue stripe wire connects? Is it in the tunnel by the hand brake assembly?

[scarceller]

Black with Blue stripe wires are typically for lighting gauges and indicators when you turn on head lights it gets power. So see if it gets 12vdc when you turn on head lights, if so it's for lighting the heat control rotary switch or something like that. But it is not related to the 2 yellow wires.

Does your rotary switch have back lights and are they working?

[Robey5]

There is not a rotary knob that this wire would be able to reach to, just the two hand levers and the hand brake. I think that there was an automatic heating system available for this car - which mine does not have. The "in cockpit" fan is controlled by the dash board cluster of levers.

I will play with it for a little bit again tonight, and see if 12V is seen at the end of the wire when I trigger the switch to try to move the fan in the engine compartment.

(in parallel: order placed for components)

[scarceller]

In my 1984 it has a small black cube just below the 2 red heat levers, the cube has 'defrost on off' written on it and mounted to the carpet. The lettering is back lit at night with small bulb. Maybe that wire is for that bulb?

Here's a picture of the box
http://www.ebay.com/itm/151277593373

You can even see the black blue wire still on that part in ebay

[fred cook]

This wire connects to the heater indicator light that mounts on the floor just ahead of the handbrake. The blue/black wire provides power to the light which is grounded by one of the mounting screws. Here is a picture:

[Robey5]

Fantastic! Thank you for this picture. I do not have one of those buttons, so I am thinking that I am going to terminate this wire and hide it under the carpet.

[Robey5]

Ok; check that, I am not going to terminate that wire and call it good, rather... I am going to get the piece that is supposed to be there which is missing. I was really drawing a blank, because when I pulled up the carpet, I didn't know there was supposed to be a light there next to the hand-brake assembly.

Part order placed with our host....