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Old 09-21-2007, 03:00 PM
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Wiring Help for my Electric Latch

Dear Hot Rodders,

One of my winter projects is to replace theunreliable remote deck lid release in my 1940 Ford coupe.

I have found a combination latch and solenoid from Don's Hot Rods, which should do the job nicely.

My question is rather than just wire it so that the solenoid pops anytime the button is pushed. I would like to build in a safety effect: Have the unit only work when the ignition is in the off position.

This probably means a relay and here is where I get a bit stumped?

Do I set it up so that the relay is closed when the ignition is in the "off "position, meaning thattwhen the ign is on (hot) the relay opens thus interupting the circuit?

If this is a good way to go, I am a bit unclear as to which terminals of the relay to wire to which wires of the circut. I am guessing the solenoid only has two wires one for B+ the other for ground. Putting a momentary button in line allows the circuit completion and then pops the trunk. I would put the relay in line somewhere and wire it somehow to the ign circuit thus my plea for your knowledge.

Perhaps Doc, the Electrical Guru of bunch could way in here.

Thank you all so much.

MrPhat40

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Old 09-21-2007, 03:03 PM
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Sorry MrPhat.........but Doc passed away last week............we are at loss about that.

Someone is sure to pipe up.............Sorry, I can't help on that one.
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Old 09-21-2007, 03:15 PM
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Dear Ponhco62,

Thank you for letting me know about Doc.
After posting my request for his help i read of his passing. I apologized to the readers for not reading before writing.

Yes he will be missed. I asked in my other post if it might be possible for Hot Rodders.com to add a tribute site to honor Doc and all he did for so many of us.

Sincerly yours,

MrPhat40
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Old 09-21-2007, 05:07 PM
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Relay

Hi,
I don't know where Doc got all of those wonderful diagrams, but I can't compete, and can't draw very well, so I'll just have to point you to somewhere that has a good diagram and explanation of how it works.

Yes, you can do this, it's just a little confusing since it's kinda backwards on WHEN you make it work than you would normally. There may be more than one way to do this, but this is what came to my mind initially.

Go to the link below and view as I explain how you would make this work for your situation.

Since you want it to NOT work when the ignition is on, you're right in that you want the ignition to trigger the coil on the relay. So wire the relay to come on whenever the ignition is on.

Look at the middle diagram and you want the hot wire that used to go to the solenoid to trigger it, to go to the common (30)

Then run a wire from the 87a terminal back to the solenoid.

Whenever ignition power is off, you'll have a connection back to the solenoid.

Leave the 87 terminal with no wire on it, so it connects to nothing when energized. You may want to break it off, or silicon it for safety reasons, depending on how/where you mount it.

http://www.the12volt.com/relays/relays.asp


Steve
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Old 09-21-2007, 08:59 PM
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Here is a diagram in accordance with the post from 58Apache
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Old 09-22-2007, 06:08 PM
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Dear HopUp and Apache58,

Thank you so much for the information.

It was what I needed to get going in the right direction.

Sincerely yours,
MrPhat40
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Old 09-22-2007, 07:15 PM
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buick lacrosses wont pop the trunk in gear....even with the remote
Shane
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Old 09-23-2007, 09:04 AM
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I didn't read the posted link to that relay, but those terminal numbers suggest that it is a Bosch Relay used in VWs or other German cars.
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Old 09-23-2007, 09:48 AM
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F&J, you're right. This style relay was originally manufactured by Bosch for the german auto industry.

Today this style 5 terminal relay is manufactured by hundreds of electrical companies, which the relay is still referred to as a "Bosch Type" relay and is the normal generic relay used for most 12 volt automotive electrical circuits.

You can usually find these on the shelf at your local auto parts store, I usually order a dozen at a time thru here: http://www.partsexpress.com/pe/showd...number=330-070

There are four terminal relays out there also with similar terminal numbers, but for the trunk solenoid circuit, you need the five terminal "Bosch Type" relay for the switching ability between terminals 87 & 87a.
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