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post #1 of 8 (permalink) Old 01-05-2019, 04:31 PM Thread Starter
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Electrical Question

Hello Ford Muscle Forum and Happy New Year!


Pulled the 289 and C4 on my 66 Fairlane for complete rebuilds. While they're gone I'm working on some wiring issues, one is a light located on the drivers side but is not a courtesy light and the other is the windshield wipers not working.


When I bought the car I discovered the windshield wipers did not work. Upon further investigation I discovered that the molded plastic was broke from the pot metal operating mechanism within the switch. That just sucked. Fortunately I found a NOS 2 speed switch on eBay. Got it, hooked it up, nothing. WTH!


Got the test light out and did some investigating and found that:


With the harness just before the wiper motor disconnected coming from the switch in position #1 the white wire is hot. See picture #1.


With the harness just before the wiper motor disconnected coming from the switch in position #2 the blue wire is hot. See picture #2.


With the harness just before the wiper motor connected both the blue and whited wires are hot. The pot metal at the motor is energized See picture #3.


Not sure what's happening. Thoughts?


See picture #4 for the light I have a question about. What is it?




Thanks,


Steve
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Steve

Last edited by zrsteve; 01-05-2019 at 04:34 PM. Reason: clarification
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post #2 of 8 (permalink) Old 01-05-2019, 08:26 PM
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Re: Electrical Question

the light appears to be park brake indicator. i believe the wiper switch provides a ground to make things work
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post #3 of 8 (permalink) Old 01-06-2019, 04:35 AM Thread Starter
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Re: Electrical Question

Quote:
Originally Posted by extech View Post
the light appears to be park brake indicator. i believe the wiper switch provides a ground to make things work
Yes I understand that. My problem is the wipers (motor) do not turn on, therefor my question.

Steve
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post #4 of 8 (permalink) Old 01-06-2019, 12:27 PM
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Re: Electrical Question

There were single speed wiper motors (3-wire connector) and two speed wipre motors (4-wire connector) in 66. Which do you have?

Adrian Steele
66 Fairlane Club Coupe
Gainesville, FL
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post #5 of 8 (permalink) Old 01-06-2019, 04:08 PM Thread Starter
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Re: Electrical Question

2 speed wipers, 4 wires.

Steve
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post #6 of 8 (permalink) Old 01-07-2019, 03:27 PM
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Re: Electrical Question

Have you verified that the motor is properly grounded to the chassis? I believe the Black and red wires are used to park the wipers. The blue and white wires appear to go to the motor windings. You may have a bad wiper motor. You should be able to power the motor at its connector with 12 V from the battery to the blue or white wires.


You should probably utilize an inline fuse if you run a wire directly from the battery to be safe.

Adrian Steele
66 Fairlane Club Coupe
Gainesville, FL

Last edited by AdrianS; 01-07-2019 at 03:30 PM. Reason: Further information
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post #7 of 8 (permalink) Old 01-10-2019, 12:24 AM Thread Starter
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Re: Electrical Question

Found the problem and yes it was a grounding issue. The bottom bolt on the motor that contains the grounding strap wasn't screwed in. I had to look closely to see that it was loose. Thanks for the help.


Steve

Steve
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post #8 of 8 (permalink) Old 01-10-2019, 08:10 AM
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Re: Electrical Question

The ever elusive loose ground, they are the Devil the good book talks about...
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