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MG TD TF 1500 - TF Wiper Motor Wire

My new harness has no wire/s for the wiper motor. I heard this is common on most of the new harnesses due to that wire missing on a lot of the diagrams. So do I ground the motor to the fire wall and then run a separate wire back to the switch, or run both wires back and ground elseware? I hate to run a separate wire out of the harness, but have no choice I guess. PJ
Oh yeah, what size wire? 16 gauge, 14 gauge?
Paul S Jennings

Paul I had this cloth covered mini harness made up for the TD wiper feeds before I discovered that on my model the black & green wires were originally covered with a grey sheath. It matches the original harness, black with a yellow trace, so if you think it's suitable you can have it for what it cost me. Cheers
Peter TD 5801

P Hehir

Peter, that is really nice and I'll keep it in mind. Thanks for the offer. PJ
Paul S Jennings

Paul,
try the archive for 2004 "correct wiring of TF wiper motor and switch"
I also advise an interrupter switch as it makes life easier in light rain. If I could work out an intermittent circuit, I would. My car gets driven all year round in all weathers.
Ray TF 2884
Ray Lee

Paul, I suspect you have the wiring for the wiper motor in your harness. A ground going to the case and a hot for the motor. What I believe you don't have is the wiring from the motor to the switch and then back to ground. I don't now if it was originally in the harness or if it was always a separate sub harness.

With what I know now, if I were buying a new harness, I would go to Rhode Island Wiring and have them include it in the main harness.

MG LaVerne

Not a good shot, but you can see there is no wire coming out of my harness near the motor other than the hot wire from the start switch. PJ



Paul S Jennings

Here's how it was wired before, separate wires. PJ



Paul S Jennings

I stand corrected then Paul. On my harness you can see the light green "hot" wire and the black ground wire for the motor from the harness. The two PVC wires are what I ran from the motor to the switch and then back to ground.

Where did your harness come from?
MG LaVerne

Ray, there are intermittent switches...

http://www.musclecarswitch.com/mustang-parts.html

Geoffrey M Baker

Paul-- My wiring is similar to LaVernes. The ground wire goes to the wiper gearbox and the power wire goes to the fuse box A4. Mine is slightly different in that have the power wire going to a toggle switch mounted next to the steering column. This switch runs both wipers at once so I don't need to use the glovebox 'pull' knobs. The knobs are in the 'on' position all of the time so the toggle acts as an on-off switch.
Regarding the harness, I did not have wiring to the wiper motor in the harness, neither the main harness nor the sub-harness for the instruments. It was easy enough to run the single wire as needed.

Larry

LD Kanaster

LaVerne, I got it from Moss about3 years ago. The harness down past the motor has a double ground with a big lug and then the light wires. There's a green wire coming out of the harness about 4 inches back inside the firewall. I'm losing faith in Moss getting things correct. Shame Als gone, things might be a little different. JMHO. PJ
Paul S Jennings

OK, I have the wiring straightened out to a point, but I am missing a wire according to how the old wiring was set up. I now have the green wire and the black wire, but I'm missing a white wire. Here's a picture with the areas where the original wires were hooked up. The number one position was where the white wire was hooked up. Can you give me some direction of what wires hook up to the various points? Thanks, PJ



Paul S Jennings

Connect your black to number 3,

Connect your green to either 1 or 2.

Run a new wire from the 1 or 2 pole you didn't connect the green wire, to the wiper switch.


Run an additional wire from the other pole of the switch to a ground....I chose to bring it back to the wiper motor ground myself.

May not be correct but thats how I went about it.
MG LaVerne

Thanks LaVerne, For clearing that up, much appreciated! I know the motor runs well as I tested it after cleaning it up on the bench. Just leery of the goofy wiring on these cars. Did you convert to Negative ground? Pos ground is not a stranger to me as I had a few old Fords in the past. But back then if you goofed up and destroyed a part, you could go to Pep Boys for a few bucks and get another. Not so today as we all know. PJ
Paul S Jennings

Still positive earth, but somedays I think I would have been wise to change it over.
MG LaVerne

Hi Ray,

Check out the Maplin site and especially MK111 Adjustable Timer Kit. It only costs about £6, is adjustable and has a 5A output. There are two Maplin stores in Glasgow so I am certain there will be some in Liverpool.

Cheers

Jan
J Targosz

Easy to convert any can to the tab mounting type, just pop rivet a suitable L shape bracket to the back of the can. The originality police will struggle to see the mod.
G Evans

Let me get this straight (for a TF):

Green wire from harness to either screw on the base of the motor,

Black wire w/ grommet from harness to gearbox cover,

New green wire from unused screw on the motor up to the switch, and

New black wire from switch down to gearbox cover(attach with a ring grommet).

But....an old archive from Don Harmer (2003) says a BROWN wire runs from the motor to the switch.

Which is more correct?

(I'm negative ground)
thanks,
Tyler
Tyler Irwin

The wiring from the motor to the switch and back is a separate pair not in a harness. My wiring for this is the original and the color may have changed from green to brown with age, aS it had on other wire sin the harness.
It doesn't matter anyway since it is not in a harness.

All that is required is a colored wire runs from the lower terminal on the motor to the switch (the switched hot wire runs to the top terminal) and a black wire comes from the switch to the case via a ring terminal.

The case is grounded separately by a black wire!

Don Haemer

Don Harmer

Tyler, I found my wires for the wiper motor in my new harness. They eluded me as they were back inside the car. I pulled more of the harness through and there they were. A green wire and a Black wire with a connector on the end. I put the Black wire to the gear case and the green wire in one of the grub screws. Then I ran a separate white wire from the other grub screw back to the switch and the other wire on the switch went to ground. My car is positive ground if that makes any difference, which on the wiper motor, I don't think it matters. PJ
Paul S Jennings

This thread was discussed between 06/01/2015 and 16/01/2015

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