Awesome Push Button Ignition

Step 3 Assemble the Hardware

Now we will solder together the chain of switches and wires and buttons and relays to make this all work. This is by far the easiest step.
Basically the way this all works is that the Ignition wire, which needs to remain a closed circuit as long as the engine is going is connected to the relay, and we will borrow some of the current going through it to switch the relay and start the engine. Solder the wire ends to the Ignition wire or the starter wire as indicated.

Comments

[hondacivic158]

so what color wires from the ignition key go where on the relay?? still confused

[hurbina]

on the drawn figure wouldnt the momentary button wire be 86 and the one with the toggle be 30 and the and the looped 85 and the bottom right 87.

[oshadrina stewart]

Can you label which terminal is which in your "inside spst" and which terminal and which goes where? It seems like you have a fith terminal though but Its hard to tell.

This is what I though

Bosch usual relay - on fig 3 (inside spst relay)
#30 bottom right
#85 top left
#86 Bottom Left
#87 top right

#87a Is not shown

http://www.mp3car.com/the-faq-emporium/117895-faq-relays-how-they-work-and-how-to-wire-it-up.html

[demonas]

why relay? isnt there simplier way? Or maybe I dont understand something...

[jpayton]

The relay has a higher tollerance than the switch. and is less likely to fail. (if it fails your engine dies, loosing power steering and brake assistance. small car thats not a big deal but if you have an SUV or truck or are hauling your going to have a stoping adventure. lol

[punx777]

Agreed. There are many relays in your car. Supporting those high amperage lines may be too much for a little switch to handle all the time.

[jpayton]

You should use solderless crimp connections in any auto application. especally wires. As the wires bounce the solder cracks and loosens. Crimp connecters have plenty of give. If one of thoes wires breaks loose. Should use an automotive relay as well. They just have stronger coils.

[fredyakaoso]

in the wire drawing you didnt label a wire coming of the relay (button left) to what does it connect?

[strangethecat]

Hey, what's the unlabeled wire coming off of the relay here? I've got that the IGN wire runs from the battery to the relay & Kill Switch and then on to the key, but do you cut the Starter Wire and run it from the battery directly into the relay? What about the other side of the Starter Wire?

[jmt31288!]

what do you expect. its a guy who drives a honda. duh

[Ace Frahm]

the circuit as drawn appears to have a 5 contact relay. How is that supposed to work?