wiring relays

ldj · Nov 26, 2016

On the little square plastic automotive relays how to use 2 of then to reverse a motor? I have or had a diagram but can't find it now.

Greg K · Nov 26, 2016

Usually switch #5 and #8 on a single phase
AC motor. Ifor you are talking about a 12
volt DC motor, then just switch positive and
negative usually.

Geo-TH,In · Nov 26, 2016

I can't think of a way to do that with an auto relay. The automotive relays I have are single pole double throw.

I'm thinking drills reverse direction using a DBDT switch, similar to a 4 way switch in house wiring.

geo

guido · Nov 26, 2016

Hello ldj,

Here you go! I made this sketch years ago 30 is power in

Guido.

RusselAZ · Nov 26, 2016

I think it takes 3 if memory serves. I have a diagram but it is at the shop

bigbob1939 · Nov 26, 2016

Idj, I dont think you can do this with the small relays. You need a reversing relay
to do this. Check Surplus Center. #11-3421. $32.95. There is a wiring diagram
on there web site showing how to hook it up. Bob

bigbob1939 · Nov 26, 2016

Idj, I did some checking, you can do it with the small relays. Look up Surplus Center, item number 11-3222. It is the relay and plug. Good for 40 amps. Wiring diagram on web page shows you how to wire. Bob

ldj · Nov 26, 2016

(quoted from post at 22:52:53 11/26/16) Idj, I did some checking, you can do it with the small relays. Look up Surplus Center, item number 11-3222. It is the relay and plug. Good for 40 amps. Wiring diagram on web page shows you how to wire. Bob

Thanks very much, just what I was looking for.
Leo

T in NE · Nov 27, 2016

If you're talking something like a car
window motor, it can be done with 2
standard relays. Wire them both to ground
when not triggered, then use a spst (or
dpdt) to trigger one relay at a time.

RusselAZ · Nov 27, 2016

Here are three pictures I have saved over the years. Using the little square 5 pole relays is one picture, there is one picture using 4, 3 pole (body ground) relays for heavier amps and then another that is just for fun as it says on the sheet. It drove me nuts trying to understand why the manufacturer used 3 relays.

Charles in Aus. · Nov 27, 2016

That is the cutest relay controlled dog I have ever seen Russel

RusselAZ · Nov 27, 2016

All you need to wire him is a squeaky tennis ball!

El Hombre · Nov 28, 2016

I remember working on Japanese cars in the '70s and '80s; that was when they had cascades of relays; tripping other relays, tripping more relays, tripping some more relays, tripping yet more relays....and we never had any factory wiring manuals. Just the single page for the entire car you got in a Chilton.

If it wasn't something pretty obvious, we told them to take it to the dealer, they had the good manuals and more important, an identical car with know good parts they could swap parts off. That saved so much time being able to just plug in another part and not spend an hour going thru a trouble shooting exercise to get the same result.

wiring relays

ldj

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Greg K

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Geo-TH,In

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guido

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RusselAZ

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bigbob1939

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bigbob1939

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ldj

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T in NE

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RusselAZ

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Charles in Aus.

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El Hombre

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