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Old 06-24-2020, 07:13 PM   #1
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Making a windshield wiper delay circuit

I have cobbled together a delay circuit for the non-park feature windshield wiper on my MS Pilot II. This design applies only to wiper switches which interrupt a SINGLE 12-volt power wire going to the wiper motor.

Parts I used:
Spade connector expander for the panel Carling rocker switch at the helm - https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

6 mm universal joints - https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Brass knob - https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Push on/off button - https://tinyurl.com/y87aseef

Plastic box to contain circuit board - https://tinyurl.com/y8olunk2

Delay circuit board - https://tinyurl.com/y77f9p3u

6mm brass rod

Below is what it looks like ready to be installed on my boat. All connections on the back of my wiper motor switch (Carling lighted rocker) are spade type, and no existing wires were required to be cut or modified. Only two small holes in the console are required for the installation. The box can be wire tied or glued into place behind the console.

The push on/off switch is required in the wire between the normally closed contact on the circuit board and where that wire ties into the normally open wire and the power wire heading out to the wiper motor to enable switching between delay wipes and continuous wiping action.

The roughly one-second time for the wipe is not controllable on this circuit board which for my motor means a single wipe from one side to the other PLUS a bit. Without a park feature, the wiper never ends up in the same place; so if this would bother you, this circuit is not for you, and you need to go to the very expensive solution of ripping out your non-park motor and install one with that feature. However, for me, it eliminates me having to have my hand on the switch all the time when conditions required an occasional swipe (often the case on this wet riding boat).
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Old 06-24-2020, 08:09 PM   #2
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The links take me to my Amazon account page. Hmm, maybe it's an Apple thing.
I wanted to check out the delay circuit. Whenever I need to do something like that I use
an octal-base(!) industrial timer relay. They are convenient but kind of bulky in comparison.
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Old 06-24-2020, 10:46 PM   #3
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Quote:
Originally Posted by KnotYet View Post
The links take me to my Amazon account page. Hmm, maybe it's an Apple thing.
I wanted to check out the delay circuit. Whenever I need to do something like that I use
an octal-base(!) industrial timer relay. They are convenient but kind of bulky in comparison.
I checked them on Win 10 on Preview and all was well with the first two. However, the rest are as you say.

Here is the push on/off button https://tinyurl.com/yarjrcwy

Here is the circuit board MaxxTronic MXAO41 https://tinyurl.com/y7qhk6wk

The plastic box is just any old box that will fit a 2.5 by 2 inch cicuit card with 0.8 inch depth.

Sorry for the bad links.
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Old 06-25-2020, 07:31 AM   #4
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I like it! When I put in self parking wipers over the winter this year, I put in a on-off-(on) switch, so you can hit the momentary position briefly as a "wipe once". Much better than the switch flipping game with the old on/off switches and non-parking wipers.
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Old 06-25-2020, 09:06 AM   #5
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For my particular installation, with a lighted Carling rocker switch, the installation is easy because you have a convenient 12-volt and ground source for the circuit board power at the back of the switch - just tee off and run the wires to the CB. The single power wire running off to the motor is pulled from its spade connection on the Carling switch, and the delay CB's common terminal is then connected to the now vacant motor power spade on the Carling switch. The N.O. and N.C. terminals of the CB are connected to the disconnected end of the power wire to the motor, with the N.C. terminal of the delay CB running through the push on/off switch. In operation, the Carling switch is pushed on acting sort of like a circuit breaker, and the delay knob has to be turned past the off detent to "on" (if it was not left twisted on the last time the wiper was run). Delayed wiper action ensues. If the windshield gets so much water on it that continuous wiper action is needed, the push button is pressed. It is a bit Rube Goldberg-ish but it is the only way short of major surgery replacing the wiper motors that I can get what I need.
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File Type: pdf Wiper delay diag.pdf (380.7 KB, 6 views)
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