Thread: 53 Is back from the Body Shop

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Here are some options to the same circuit;

Assuming door is closed and relays are at rest, when door is opened:
#1 Will not work as there is no power to the horn but would work if there was a constant power to pin 85 of the 2nd relay

#2 Will not work as there is no power to the horn unless the relays are energized and they can't be energized since there is no ground for the relay coils.

#3 Will not work since there is no ground for the relay coils


Please correct me if I'm wrong.

Originally Posted by NTFDAY

Assuming door is closed and relays are at rest, when door is opened:
#1 Will not work as there is no power to the horn but would work if there was a constant power to pin 85 of the 2nd relay

#2 Will not work as there is no power to the horn unless the relays are energized and they can't be energized since there is no ground for the relay coils.

#3 Will not work since there is no ground for the relay coils


Please correct me if I'm wrong.

Sorry, got to go to band practice, I'll have to resume this tomorrow.
Look closely at the diagrams, the ground is set by relay #1 when the door jam switch engages which latches relay #1 to ground through 30 $ 87, this in turn activates and hold relay #2, #2 supplies the 12VDC+ to the horn through 30 & 87, the horn grounds directly. Switch interrupts the latch, starting the circuit over.

Here it is with a delayed entry/exit;

Originally Posted by 36 sedan

Sorry, got to go to band practice, I'll have to resume this tomorrow.
Look closely at the diagrams, the ground is set by relay #1 when the door jam switch engages which latches relay #1 to ground through 30 $ 87, this in turn activates and hold relay #2, #2 supplies the 12VDC+ to the horn through 30 & 87, the horn grounds directly. Switch interrupts the latch, starting the circuit over.

Here it is with a delayed entry/exit;

Without a ground on the end of the coil the relay will never energize unless 87 and 87a are reversed and with the toggle switch closed how do you get power to the positive side of the coil?

I have an external interrupt switch installed. I did not know they made a delay switch, I really got to catch up on this whole electronics thing. At first I thought the delay switch would be a great idea, but then I realized that if I open my doors after it sat a while, I would set the alarm off myself. The delay switch would work good for setting it but not for getting back in. When I get Rita back from the shop I'm going to be anxious to wire it up.

Originally Posted by 53 Chevy5

but then I realized that if I open my doors after it sat a while, I would set the alarm off myself. The delay switch would work good for setting it but not for getting back in. When I get Rita back from the shop I'm going to be anxious to wire it up.

Look closer, the module gets it's initial ground through the door jam switch starting the delay. When you leave the door jam switch starts the delay so you have time to leave, close the the door before the delay is up and it starts all over because the relay hasn't latched yet. Open the the door to get in, the module grounds and starts the countdown again, turn the activation switch off and nothing happens, don't turn the switch off and the alarm activates once countdown is done. The trick to this circuit is to set the delay for it with as little time as possible so the crook doesn't have enough time to close the door, yet you have enough time to de-activate.

Want to go a little further, add a wireless remote switch, no delay needed.
https://www.amazon.com/dstfuy-Wirele...NsaWNrPXRydWU=

Or, use your phone;
https://www.amazon.com/DSD-TECH-Blue...1607327&sr=8-3

I see what you're seeing, I used generic pictures for the switch and jam switch, it shows the jam switch as closed should be open, the activation switch is closed. Circuit is at standby waiting to activate by door jam switch contact.
Make better sense. Sorry, I sometimes assume everyone sees what's in my head.

Originally Posted by 36 sedan

I see what you're seeing, I used generic pictures for the switch and jam switch, it shows the jam switch as closed should be open, the activation switch is closed. Circuit is at standby waiting to activate by door jam switch contact.
Make better sense. Sorry, I sometimes assume everyone sees what's in my head.

This will work as intended if the jam switch is connected to pin 85 of the first relay and pin 87 of the first relay is connected to pin 85 of the second relay. The jam switch as you have drawn shows it grounded through it's mount which is correct unless you're working on a plastic car such as my 76 Corvette. But being grounded in that manner has no effect on the switch as it's contacts are insulated from the body of the switch. Every jam switch I've ever dealt with has two contacts for connecting wires and they are insulated from each other until the switch is made. One wire is usually grounded and the other wire goes to whatever is being controlled, ordinarily a dome light or under dash light(s).
The only other type of jam switch I've encountered are roller switches used on aircraft to let the pilot know when a door is closed. The ones I am familiar with are three pin switches configured like 30, 87 and 87a in a SPDT relay and I found many to be wired wrong on DC-9 and DC-10 aircraft.

I would use an alarm siren instead of a car horn, the battery will last longer.
https://www.amazon.com/Universal-Aut...-1106151859392

I was wondering the same thing.

Ken, certainly no disrespect intended, but I believe we have derailed. The intent of my drawing was not to make a universal alarm system, and of course a separate ground wire would be needed for plastic. Rather, my drawing(s) represent a simple solution to the OP’s question for a latching relay set up that would control a 12 volt horn mounted under his seat that would activate when the doors are opened without being overly complicated. I believe I accomplished that.
I’m sorry for any miss givens, miss understanding, or confusion, anyone is welcome to use or lose the design at their choice. I bid a fair goodbye......

Originally Posted by 36 sedan

Ken, certainly no disrespect intended, but I believe we have derailed. The intent of my drawing was not to make a universal alarm system, and of course a separate ground wire would be needed for plastic. Rather, my drawing(s) represent a simple solution to the OP’s question for a latching relay set up that would control a 12 volt horn mounted under his seat that would activate when the doors are opened without being overly complicated. I believe I accomplished that.
I’m sorry for any miss givens, miss understanding, or confusion, anyone is welcome to use or lose the design at their choice. I bid a fair goodbye......

No disrespect intended or implied. I freehand most of my diagrams, not that computer savvy, and usually end up constructing them on a breadboard to iron out my mistakes.
I checked out delay units on EBay and found this dandy little item https://www.ebay.com/itm/12V-DC-Mult...sAAOSwNYZerVWg

No disrespect intended to anyone.

Most of the circuits I use and embellish upon are known, proven and working industry standard circuits. Occasional I make errors and I’ll admit I did not make it clear on the prior drawings that the activation and door jam switches were copy and paste generic internet pictures, not necessarily shown in their correct positions. I also assumed everyone would see the drawing was in its standby state with the activation switch on, ready to be triggered by the door jam switch when it engaged and that I was using a standard automotive relay footprint.

Im sorry I mislead anyone to think otherwise.

The drawings were done quickly on the fly with no written instructions to explain function. My intention was and has always been to help, not confuse. I believe I straightened all misgivings out in the later drawings. While I try to keep on topic and uncomplicated, unfortunately I don’t always succeed. It is never my intention to mislead, misguide, misdirect, argue, fight or complicate issues, and again my apologies, I don’t always succeed.

Though I have acquired some knowledge, I’m not to be considered an expert by any means on any topic. However, I truly enjoy sharing knowledge and helping. Unfortunately sometimes I assume everyone else can see what’s swimming inside my head and unintentionally leave info out. It’s not intentional, certainly not meant to misguide. Lately, I seem to be a catalyst of misleading, misguiding, misdirecting, arguing, fighting and/or complicating issues.

Sorry, I’ll refrain....

Originally Posted by 36 sedan

No disrespect intended to anyone.

Most of the circuits I use and embellish upon are known, proven and working industry standard circuits. Occasional I make errors and I’ll admit I did not make it clear on the prior drawings that the activation and door jam switches were copy and paste generic internet pictures, not necessarily shown in their correct positions. I also assumed everyone would see the drawing was in its standby state with the activation switch on, ready to be triggered by the door jam switch when it engaged and that I was using a standard automotive relay footprint.

Im sorry I mislead anyone to think otherwise.

The drawings were done quickly on the fly with no written instructions to explain function. My intention was and has always been to help, not confuse. I believe I straightened all misgivings out in the later drawings. While I try to keep on topic and uncomplicated, unfortunately I don’t always succeed. It is never my intention to mislead, misguide, misdirect, argue, fight or complicate issues, and again my apologies, I don’t always succeed.

Though I have acquired some knowledge, I’m not to be considered an expert by any means on any topic. However, I truly enjoy sharing knowledge and helping. Unfortunately sometimes I assume everyone else can see what’s swimming inside my head and unintentionally leave info out. It’s not intentional, certainly not meant to misguide. Lately, I seem to be a catalyst of misleading, misguiding, misdirecting, arguing, fighting and/or complicating issues.

Sorry, I’ll refrain....

Nonsense, a good healthy discussion is good for the soul.