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Old 12-21-2005, 05:04 PM
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Wiring Questions Retractable Licence Plate

We (my son and I) built a retractable license plate for our project car. As seen in this short clip.

Retractable License Plate in Action

We are having some questions on components for wiring. Limit switches seem to be either very expensive or are rated at very low amperage. That being said would the limit switches that are in the door jambs of most cars to turn the interior lights on and off be acceptable for this application?

Second components question. Are there any common automotive style relays that would be able to switch two circuits at the same time. I think these are called DPDT (double pole double throw) relays? What I am hoping for is to be able to go to the auto wreckers and pull one out of a car.

I have attached a schematic using two relays that I had lying around. The goal is to replace them with one to tidy things up a bit.

Thanks
Ric
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Old 12-21-2005, 05:51 PM
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Doc here,

KEWL project Mr Bond...

You first might consider an over ride switch If you plan to park on public streets..else suffer the wrath of the parking lot Nazi's..

Next MOST automotive Dome door post switches are single conductor and designed to switch ground (the body being the second conductor) So If you plan on using that type of situation, you must provide isolation above ground if power is to be run through it. (not a good choice, as sooner or later it will move and short) A better option would be an alarm Sales/Install shop for a duel pole switch with a large enough contact rating.

How much draw are these motors? you may have to go relays here too If it's really that high.

Yes , In fact you can find a DPST up a 4PST relay (Double pole Single throw) for your application. Rat Shack has them for up to 10 A Contact ratings for $6.95 & up per..Or you can go automotive types for about the same or a little more..

In fact, you are Courting disaster on a motor reverser using 2 independent relays. Should one coil fail, a fuse to one blow, or one hang for any reason (and Murphy Say's someday they will..) you have a relay operated dead short! Because the contacts are not mechanically related.

Hope that helps.

Doc

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Old 12-21-2005, 08:49 PM
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Good Point on the single relay. One don't work and shes toast.

I will definately change it over to a single relay, But doesn't the relay have to be double pole double throw to switch a motor? When I did the test wiring with the two relays I had they are single pole double throw so that makes it a double pole double throw circuit ??? I think??? doesn't it?

As for the over ride switch thats a good idea too. In she goes.

I don't understand what you mean about the door post switches though. They are controlling the positive side of the circuit aren't they??? The Dome light in my car is directly grounded to the body at the light iteslf. So that would make it an insulated switch with a pretty high wear and tear rating considering the number of times it operates in a vehicles life. (Wouldn't it?)

Ric

Oh Yeah Merry Christmass to you also. Nice signature/avitar thingys you got going there.
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Old 12-21-2005, 09:09 PM
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Quote:
Originally Posted by Ratchet
Good Point on the single relay. One don't work and shes toast.

I will definately change it over to a single relay, But doesn't the relay have to be double pole double throw to switch a motor? When I did the test wiring with the two relays I had they are single pole double throw so that makes it a double pole double throw circuit ??? I think??? doesn't it?

As for the over ride switch thats a good idea too. In she goes.

I don't understand what you mean about the door post switches though. They are controlling the positive side of the circuit aren't they??? The Dome light in my car is directly grounded to the body at the light iteslf. So that would make it an insulated switch with a pretty high wear and tear rating considering the number of times it operates in a vehicles life. (Wouldn't it?)

Ric

Oh Yeah Merry Christmass to you also. Nice signature/avitar thingys you got going there.
Doc here,

The dome light post switches (on most vehicles, are ground operated) the body of the switch is metal, and makes a contact as it sits in the door post itself...this is why these only require 1 wire..the push contact..the second wire (or completion of the circuit) is the body ground on the switch.. On most dome lamps, If you ground the wire at the switch, the light goes ON..

They switch the ground, the power is wired direct to the bulb socket..(in most cases..) They are good switches, because they are simple (small moving part count, and never see shorts..) is why they last so long.

A Double pole single throw relay will work fine for a reverser, you only need to energize the contact one time to reverse the polarity..can be done with Cris~Cross jumpers at the relay, provided you have the limit switches set properly. The non energized side will be say...up..cut off by the limit at the end of the travel..

Did I explain that OK enough? Clear as mud huh?

Doc


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Old 12-21-2005, 09:33 PM
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Ok I get the door post switch thing. Can't use them. Any suggestions on an inexpensive limit switch?

As for the relay thing It needs to look like the attachement doesn't it.???

Thanks Again
Ric
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Old 12-22-2005, 04:06 AM
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Doc here,

Yes , on the relay..

Do you have a Fry's Electronics near you? go there to the parts section and chose one..about $2 Each.........

Doc




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Old 12-22-2005, 08:10 AM
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Thanks Doc!

Merry Christmas

Ric
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Old 12-22-2005, 09:21 AM
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Quote:
Originally Posted by Ratchet
We (my son and I) built a retractable license plate for our project car. As seen in this short clip.
Thanks
Ric
Made for traveling the 407?

Princess Auto on Exiter will have the components you need.
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Old 12-22-2005, 12:38 PM
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Quote:
Originally Posted by 58Chev
Made for traveling the 407?

Princess Auto on Exiter will have the components you need.
I have been to princess Auto and they do not have the relay I need. They do have a couple limit switches but they look pretty flimsy.

As for the 407 we decided to wire it to the key so there would not be any temptation. When you turn the key on the plate is visible when you turn it off the plate goes away.

off for show on for go.

Ric
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