Strange Electrical Issue with my wiper circuit

[Blitzboy54]

I have a weird problem with my wiper circuit. I installed a rotary style wiper switch because I could put a knob on it that matches the headlight switch and aesthetically I like how it looks. this is the same switch I used on my last build and never had an issue. In my last car I used a Ron Francis switch seen here

https://www.ronfrancis.com/product/175

This time I purchased a Cole Hursee switch that is electrically identical. I picked this because the body isn't quite as big and I have a little less room to work with

https://thefactoryfiveforum.com/attachment.php?attachmentid=207707&d=1734571701

https://thefactoryfiveforum.com/attachment.php?attachmentid=207706&d=1734571701

It worked the first couple of times I tried it but I wasn't sure I heard it go to park or if I had just shut it off in the sweet spot so I cycled the switch on and off a couple of times and then I heard a pop. The 10a fuse had blown. I replaced the fuse and from that point on if I simply turned the key to accessory the fuse would pop. I pulled the power from the switch and it was fine, pulled the power from the motor but had power at the switch and the fuse would go.

I then put the FFR switch in and everything is fine. I can run it with a 5a fuse if I want. So I assumed I had a bad switch and ordered a replacement switch. The new one arrived today and I installed it and again as soon as I put the key to ACC the fuse pops. I powered my car with a 12v power supply attached to the battery leads. Thought maybe something goofy is happening with that so just to be sure I then tested again by connecting an actual batter to the leads. Pops the fuse every time. Wired as instructed

What am I missing?

Does anyone have any ideas?

https://thefactoryfiveforum.com/attachment.php?attachmentid=207705&d=1734571701

[F500guy]

I thought a relay was required for the rotary type switches, but said it worked before in last build? I saw a drawing once but can not find it now.

[Blitzboy54]

Thanks, I should have done a google search. The park feature shorts out. It’s not apples to apples either the other switch. I found it on the other forum. I will have to decide on the RF switch again or stick with the toggle.

https://www.ffcars.com/threads/cole-hersee-vintage-rotary-wiper-switch.640655/

[Blitzboy54]

I thought a relay was required for the rotary type switches, but said it worked before in last build? I saw a drawing once but can not find it now.



I think I figured it out. The Hursee switch when off puts 12v to park. Then 12v to low and high respectively. The FFR switch when off shorts park to low not 12v. That’s why it’s popping the fuse. The Ron Francis switch follows the FFR logic (or vice versa). So I can either use the toggle, purchase the RF switch, not use the park feature or figure out a way to get the existing switch to short park and low.

I think I can do it with a relay. The one I bought for the headlights was a two pack so I have a spare. If I use the 12v from the park and run it to 85 then run 86 to ground it will switch every time I put the wipers to off. Take the park wire to the motor and terminate to 87 and run a jumper wire from the low to 87a I think that would do the same thing.

I will give it a try it tomoorw.

[dbo_texas]

Not sure if this aligns w/ the FFR wiper motor but looks like a similar rotary switch...using a relay.

https://www.youtube.com/watch?v=iuqZmm9nRZs&ab_channel=WiringRescue

I'm using a '65 Mustang rotary wiper switch and I'm hoping to get it working without a relay. This is my "plan" but I haven't verified if I have this correct yet. That'll be one of my TO DO items over the Christmas break.
https://thefactoryfiveforum.com/attachment.php?attachmentid=207744&d=1734635309

[Blitzboy54]

Curious what your results end up being Mike. For me it didn’t work. I dint the relay separates power fast enough. It didn’t pop the relay in park but if I switch in power the fuse goes. I’m admitting defeat and moving on to the toggle. I’ve decided I like how it looks.

As my high school senior likes to say to me

“Womp Womp”

[rich grsc]

Use the 65 Mustang switch, it works

[dbo_texas]

Use the 65 Mustang switch, it works

Hey Rich do you know if the RF wire colors I have listed next to the 65 Mustang switch terminal letters are correct on the right side of my diagram? I'm having a hell of a time figuring out if I have this correct and as far as I can tell from extensive forum searches, nobody has posted this for the Mustang switch. All the 2-speed mustang wiper motor wiring diagrams are different than the FFR wiper diagram so I'm trying to merge the two. I went to test the Mustang switch today to see what connects to what, but my switch was broken and the entire back section fell off....just purchased another one but won't get here until New Years.

[Blitzboy54]

Hey Rich do you know if the RF wire colors I have listed next to the 65 Mustang switch terminal letters are correct on the right side of my diagram? I'm having a hell of a time figuring out if I have this correct and as far as I can tell from extensive forum searches, nobody has posted this for the Mustang switch. All the 2-speed mustang wiper motor wiring diagrams are different than the FFR wiper diagram so I'm trying to merge the two. I went to test the Mustang switch today to see what connects to what, but my switch was broken and the entire back section fell off....just purchased another one but won't get here until New Years.

You have 4 connections for the wiper motor if you’re using the FFR offering.

12v
Park
High
Low.

Use a meter and if the following is true you should be good to go

Off = continuity between low and park
Position 1 = 12v and low
Position 2 = 12v and high

[rich grsc]

I can't help with wire colors, as I didn't use a RF harness. I too used a meter to determine the correct wires