Not too sure I'm posting this in the right forum, but here goes:

My wiper parking switch seems to be NFG. I didn't even realize I had one (wipers always just stopped dead wherever they were when I shut off the switch), however yesterday, after driving to work, I shut them off and, as if by magic, they returned to a position lower than they had ever previously gone. I have not been able to duplicate this effect. It seems to me I must have a faulty parking switch. Is this a serviceable component? Is there a PN# for a replacement? It is a "3-speed" wiper motor in a 1970 Dart.

Any advice?

Thanks,

Nat

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1970 four-door Dart, 225/A-904/2.45 gears. 0-60 in twenty three minutes!

Could be that the switch is just corroded and dirty on the inside, and that one time it worked.... or it could be that the park brushes on the motor are wiped, and they just so happened to work that one time.

~THOR~

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1984 D100 Shorty Custom
Certified Auto Appraiser - RevItUp Classic Appraisals
President - Cherry City Bombers CC
Part of Tyrde-Browne Racing

THOR,
Thanks for the reply. I'll pull the switch and clean it up later. If it's the motor brushes, how do I fix it? Are wiper motor brushes available?

Thanks again,

Nat

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1970 four-door Dart, 225/A-904/2.45 gears. 0-60 in twenty three minutes!

Worn brushes in the motor typically mean that it's time for a new motor. I am not sure what you can dig up as far as rebuild parts, but if the switch doesn't fix it, you may consider taking it to a trusted alternator/starter rebuild shop. They should be able to fix it up pretty easily.

~THOR~

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1984 D100 Shorty Custom
Certified Auto Appraiser - RevItUp Classic Appraisals
President - Cherry City Bombers CC
Part of Tyrde-Browne Racing

Worn brushes wont stop a wiper motor from parking, it is the contacts in your switch. try pressing the knob in like a button, it may force them into contact. i have been limping the wipers into park this way for years...

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I've been calling it as i see it for my entire life and that's not about to change. Take it or leave it.

When I press the knob in, wiper fluid sprays on the windscreen. The switch is sealed too, so I'm gonna hunt me up a replacement. Y'know? It's funny. It didn't bother me not having a working parking switch until I found out the car had one that simply wasn't working. Now it drives me spare.

Thanks,

Nat

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1970 four-door Dart, 225/A-904/2.45 gears. 0-60 in twenty three minutes!

Wow... you have an electric washer motor?! I have to pump the plunger on the floor!

You guys and your modern 1970 cars!

-Mac

You have washers? I have to get out and use a spray bottle!

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"When you find a big kettle of crazy, it's best not to stir it." - Pointy-haired Boss

1964 Valiant V200, 225/Pushbutton 904
BBD, CAI, HEI, LBP, AC, AM/FM/USB, EIEIO

I've worked with a lot of variable & 3speed setups. The logic is moderately tricky (see the FSM for a truth table), and the normal park function on most actually reverses the motor's direction, causing the wiper to swing in a longer arc than normal and park lower. All the 3speed setups I've work on required a good ground at the switch to function properly.

I've seen an E-body with a ungrounded switch that left the 3sp motor getting current all the time and getting hot while not moving.

Note that the park switch cam breaks very easily if it gets forced. It is fairly easy to access, but I don't know where to get a replacement.

what does that cam look like?

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I've been calling it as i see it for my entire life and that's not about to change. Take it or leave it.

I opened up the cover on the gearbox and inspected the contacts on the park switch. They were clean as a whistle, but I cleaned them anyways. Nothing looks broken in there, but the park function still doesn't work. I'm starting to suspect a bad connection somewhere up the line. Any pointers on troubleshooting the wiring? I am by no means an electrician.

Thanks,

Nat

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1970 four-door Dart, 225/A-904/2.45 gears. 0-60 in twenty three minutes!

yes, i will try to walk you through it. what colours are the wires at your motor? do you have four; blue brown red and green?

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I've been calling it as i see it for my entire life and that's not about to change. Take it or leave it.

They're all more or less grime coloured I'll take a picture and post it tomorrow.

Thanks again,

Nat

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1970 four-door Dart, 225/A-904/2.45 gears. 0-60 in twenty three minutes!

if they are the colours i described, you can force the motor into park by disconnecting the plug, jumping green wire to brown, connecting red to ground, and blue to +12V. this will run the motor to park position and stop. if the motor does not run, then the motor's park switch is open. this may be because the gear and cam mechanism are not closing it, due to being broken or improperly assembled. the design varies, a photo of the open gear housing assembly will tell us more. i am quite certain that the motor needs to be in a specific position in order to disassemble and reassemble the gear and cam assembly properly and without damage, if i had a manual for your specific car i could tell you. most wiper motors have a service position for the gear and cam assembly.

if the motor parks the wipers as normal during the test, your dash switch or the wiring leading up to it are faulty. get out your multimeter and we will test the wiring and switch.

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I've been calling it as i see it for my entire life and that's not about to change. Take it or leave it.

Stand back, Dr. Steponmebbbboom is in da HOUSE!

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