From Vac to 12V Wiper System

Jul 29, 2018 5:48 PM - 155 Views Create A New Thread

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Pickerington, OH

Wiper Conversion
I got caught in the rain again with my 57 Ford a couple of weeks ago. I use Rainex, but there is still nothing like having good wipers when those big fat raindrops are coming down. My vacuum wipers work, but they are still lees than adequate. I can't see spending $110 on another vacuum wiper motor, just to end up with the same thing. The vacuum assist on the fuel pump, to me does very little. So I ordered the kit to convert the system over to 12V.

I have the switch installed, and the motor hung. Now the question, where to pick up the 12V?

I thought I'd just get my manual out, and see where the optional 12V systems in 1957s picked up the power, and go from that same point. Guess what, evidently all 1957 Fords came with vacuum wipers. So do I try to cut the wires going into the plug at the back of the ignition switch, and pick up my ACC wire there, or do I go out the the ACC side of the starter solenoid?

I considered a 6A fuse holder as quickly as I can pick up my power (meaning near), but also considered a 6A circuit breaker. I'm pretty sure I can order the breaker over at NAPA. I'm thinking I'm going to lean towards the fuse. Mfg says fuse is OK, and breakers while resetting, (may) have different trip charactaristics. I'm always reluctant asking someone behind the parts counter technical questions about parts, unless they are so complex that it makes them pick up the telephone and call product engineering at the manufacturer. Evwen then, you don't know who they are talking to, perhpas it's there technical Q&A people in some far off place.

I am more interested in getting it right, as opposed to saving time, or a few bucks on electrical goodies. So advice on where to pick up the 12V power feed? Maybe hacking into the original wiring harness isn't such a good idea. It's 1957 haness, but you'd never know it. No one has been under there hacking it up, it's never even had a radio change.

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  • GeneF
    Aug 12, 2018 at 4:01 PM

  • Here is a new development. The wipers work fine, but they seem somewhat slow. Even on high speed they seemed not to be operating quite right. I pulled the inspection plus on the cowling, and even lubed the cable assemblies, and that picked up the speed marginally. Then after sleeping on it, I put a test light on the ignition terminal that I hooked my feed to, and it seemed to glow dimly. After thinking about this, I thought I wonder if it's getting full voltage. If I take the wire off and touch it to the batter cable terminal what happens. When I did that they really took off. In the process now of getting a 6A circuit breaker, and will be putting that on the battery feed side of the solenoid. Some times asking yourself what-if makes all the difference.

  • GeneF
    Aug 4, 2018 at 1:55 PM

  • The MFR recommends a 6 amp max fuse. A 1957 Ford does not have a fuse panel, the cars were not built that way.

  • jimmothershead
    Jul 30, 2018 at 7:20 AM

  • Jeff sez it right.
    15 amp circuit must be dedicated from the fuse other loads. Same as any modern car.
    What is the load ? What is the start up load ?
    Use #14 awg wire.
    Be certain to run a good ground #14 awg.

  • tazhog54
    Jul 29, 2018 at 5:58 PM

  • i would run with a circuit breaker on a wiper motor rather than a fuse . if you ran into something that would stop your wipers and make them draw more amps than your fuse it would blow and have no wipers like in a hard rain storm ,bird hitting your wipers while in rain etc. that way it would reset and at least you would have wipers till the issue is solved . I do circuit breakers on headlights any real safety features . brake lights . taillights just like manufactures now do .

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