My '74 has a 19mm Master Cylinder.

The dash warning light has been flashing incessantly - I disconnected it a while ago. Tonight I was busy breaking my horn mechanism in the steering wheel and I decided to try to reset the button on the MC to stop the flashing.

Here's the deal. With the car on the ground and a flashlight, I managed to find the reset button. Hit it, reconnected the warning light on the dash, and it now functions correctly. (stops when the parking brake is released)

However while I was reaching in there, I accidentally disconnected what looks like a Ground wire. I don't think I have any hope of finding where it connects without taking the car to a shop and getting it up on a lift, so...

What is the risk of driving it with the ground wire disconnected from the MC?

I don't think I've ever fixed something on this car without something else. If it's not one thing, it's another. (Or as Freud put it: If it's not one thing, it's your mother.)

early cars two prong switch late cars single prong switch. the factory figured out that the switch can ground through the master cylinder!

The wiring harness has two connections. Let the other one dangle. It was already there, you just didn't notice it before.

Is the wire connected to the master cyl. switch brown with a yellow stripe? It should be connected to it if your switch has a reset button. On the orignal switch there were two wires. The "ground" you think you disconneted is solid brown and IS a ground, except with the one wire switch it is not used...connects to nothing....

You all overestimate me.

I actually did screw up, I think. See below.

It looks like the solid brown ground wire was clipped by a PO, presumably when the 19mm MC was installed. The brown/yellow stripe is the one I accidentally knocked loose.

Anybody have a good photo to show where it connects? Alternately, is the risk of driving just that I won't get a warning light if I lose hydraulic pressure?

Click to view attachment

Hooks onto that big white thing.

No, no, no...

It hooks on right here:
Click to view attachment

There should be a male spade on the back of the tie-rod end there.

Geez Mark... full of bad advice today aren't we?

What the heck you talkin' bout..........

(sorry... couldn't help myself)

The electrical connection is on the same thing that the reset button was on. Looks like that white thing in the pic is it, but I could be mistaken.

If you want to be sure, remove the gravel pan so you can get a good look at everything. Maybe put the front end up on jackstands (so we know it's a real 914!) so you can really get a look.

--DD

I'll be sure to bring my folding chair to WCR!
HINT: You'll be the blue guy!