Finally got that thing installed, wasn't as difficult as I thought it would be. I've made the obligatory how-to, and hereya go:
Installing an 'Engine Start' button.
Items you'll need:
3G Accord
High current relay
Pushbutton for starter
8 gauge wire
18 guage wire
Phillips screwdriver
Assorted crimp terminals for easier installation
As always, disconnect your negative battery terminal, because these wires you'll be cutting are live.
1. Remove the lower cover under your driver's side dashboard. Remove the two steering column covers.
2. Locate the wire bundle connected to your ignition switch, and follow it down away from the ignition (This makes it easier to wire in and place the relay)
3. Cut through the wire bundle sleeve (making sure not to cut any of the wires. Locate the black wire with white stripe and the white wire with black stripe.
Now, depending on how you want your button to work you'll be taking a different approach to this. This how-to focuses on installing the button while leaving the ignition key start intact.
4. Remove about three quarters of an inch of insulation off these two wires, but do not cut them. What you'll need to do next is strip back the insulation on two sections of 8ga wire and wrap them around the exposed sections of wire in the ignition bundle. Secure them with tight wrapped electrical tape. These will be the switch side terminals of your relay. You can connect these now if you like.
5. Locate a +12 accessory lead (one that only comes on when the key is in the ignition. This can be the ACC line to your stereo, which is EASY to find). Using the 18ga wire, run a lead from this point to one of the magnet side terminals of your relay. After that, run a lead from the other magnet side terminal of the relay to one terminal on your switch. Where you install this switch is your choice. From there, run a lead from the other terminal on your switch to ground.
6. Reconnect your negative battery cable. Turn your key to ON and push the button. If everything works properly, you'll know it. If not, recheck your connections and try again.
I've made an illustration to go along with the howto (No poking fun at my leet Paint skillz :p )
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