Circuitry masters: Pls help me examine the wiper circuitry!

Topic: Circuitry masters: Pls help me examine the wiper circuitry! (Read 4604 times) previous topic - next topic

Circuitry masters: Pls help me examine the wiper circuitry!

Reply #15 – May 20, 2009, 11:33:36 PM

Come to think of it, maybe I should be thinking about this for my junkyard trip this weekend...

Thunder Chicken, any chance you have a diagram of showing the resistances of the 88 thunderbird cruise buttons (i got the 05 explorer diagram from autozone.com)? I have the page from the thunderbird evtm but it's a bit low in resolution to make out the numbers...

Circuitry masters: Pls help me examine the wiper circuitry!

Reply #16 – May 21, 2009, 09:10:17 AM

My Mitchell OnDemand diagrams don't show the resistance values in the switch. When I get a chance I'll check my EVTM (it's out in the garage, I'm not, so I can't look right now)

Circuitry masters: Pls help me examine the wiper circuitry!

Reply #17 – May 21, 2009, 12:14:16 PM

No sweat, thanks!

Circuitry masters: Pls help me examine the wiper circuitry!

Reply #18 – May 21, 2009, 04:22:29 PM

87 evtm

Circuitry masters: Pls help me examine the wiper circuitry!

Reply #19 – May 21, 2009, 04:30:54 PM

thanks!

Circuitry masters: Pls help me examine the wiper circuitry!

Reply #20 – May 21, 2009, 04:53:14 PM

So, I'm looking at the on/off circuit for the 'bird. What I get is; if I press on the signal return (LB/BK) gets full reference voltage and if I hit off the signal return is grounded. Is that correct?

Circuitry masters: Pls help me examine the wiper circuitry!

Reply #21 – May 21, 2009, 05:23:58 PM

Quote from: booksix;273527

So, I'm looking at the on/off circuit for the 'bird. What I get is; if I press on the signal return (LB/BK) gets full reference voltage and if I hit off the signal return is grounded. Is that correct?

Signal return is the term used in the EEC circuit to describe the logic ground for the 5v reference it uses for some of the sensors.
This doesn't apply here.

The input labeled "Horn" is the ground side of the horn relay coil.
When there is no current flowing through the relay coil (you are not blowing the horn) there is 12v on this input.
Pushing the cruise ON puts this 12v on the LB/BK wire.
Pushing the cruise OFF puts ground on the LB/BK wire.

Circuitry masters: Pls help me examine the wiper circuitry!

Reply #22 – May 21, 2009, 11:11:50 PM

Well, the 05 Explorer diagram uses the term "signal return" for the cruise as well as the EEC system; so that's why I used it. But wither way, thanks. Now my biggest problem will be getting a ground source on the steering wheel side of the clock spring (the 05 explorer system uses a resistor rather than a ground for off). Other than that it looks like a bit of rewiring within the switch itself should give me what I need! :D

Circuitry masters: Pls help me examine the wiper circuitry!

Reply #23 – May 22, 2009, 08:48:59 PM

Ok, so, I cross referenced the Mark VII governor on Rock Auto to figure out which cars at the junkyard had what I needed (thank you iPhone) and ended up getting one from a 92 Taurus LX.

First, I wired it up by purely color. The wipers worked and cycled but they seemed to stay in one speed regardless of the switch position. Next, I looked at the diagram and noticed red/yel and dk blu/org going to the motor where reversed (according to the position they entered the motor symbol on the diagram). I swapped those but that just reversed the problem and had the wipers trying to cycle downward toward the cowl.

I believe the wiring on the motor side of the governor was correct the first time but the signal wires from the wiper switch must be wrong and so color matching does not work. Does anyone have a more detailed diagram than the ones below to help me figure out how to wire the 3 signal wires from the 94-04 mustang wiper switch to the 90-95 Taurus governor? Here's what I'm working with:

Thunderbird:

Taurus:

Circuitry masters: Pls help me examine the wiper circuitry!

Reply #24 – May 22, 2009, 09:57:11 PM

Mitchell OnDemand's diagram is no better (it does not show the internal circuits in the governer), but it does provide some information in the troubleshooting section. According to it, you should have power on the yellow/red wire when the switch is in LO ir HI (the power will be pulsed in INT). You should have a ground on the dark blue/orange wire when the switch is in LO or INT. You should have ground on the white wire when the switch is in HI. This is the same as the T-Bird wiper motor.

Speaking of T-Bird wiper motors, here's the terminal layout of it.

Circuitry masters: Pls help me examine the wiper circuitry!

Reply #25 – May 22, 2009, 10:36:15 PM

Awesome, thanks. I'll check that out. As far as the wiring diagrams, do they show the internal circuits of the wiper switch by any chance? I think the problem lies between the switch and the governor so being able to test those circuits would be ideal.