Remote Start Wires? What do they do?

Hey guys,

I'm installing a remote start, and I never really thought about what all the wires do.  I always wondered why there are TWO 12 volt wires, both fused.  Why not just use one?  Is it OK to splice into the same wire twice for them?

Thanks,

--mindctrl

It depends on the car you are installing the remote start in...

If you have two constant 12v wires going to your ignition then you should have one wire on one constant and the other wire to the constant.. However if you only have one constant going to the ignition then both wires can be hooked up to this wire.. As I said it depends on the vehicle and the application..

Good luck   J

Ok here's the deal. There are normally 6Ignition wires on a given R/S unit... naturally some have more outputs (acc2/ing3) and some have less.

12V+ Input ~ Supplies the ING/ACC/Jumperable with a steady 12V+

12V+ Input ~ Supplies 12V+ for Starting also powers on board relays ext

Starter Output ~ Output of 12V+ High Amperage to crank the vehicle

ING Output ~ Output of 12V+ to supply the ECM/Ignition system/Fuel system with power

ACC Output ~ Output of 12V+ to supply the blower/climate controll power

Selectable (ING2/ACC2/Starter2) Supplies 12v+ to whatever its jumpered to.

Some vehicles require more... Older fords for instance require 3 ignition wires because of the very very high current draw for the blower motor. Simply tieing this wire into the other ACC wire will do no good because now your overloading the system. Good rule of thumb with hooking up ignition wires is: If the wire your hooking up is the same size as the wire tieing into, no other wires should be connected here.

In other words, 1 R/S wire PER 1OEM vehicle wire no matter what. And if you cannot find a 2nd 12v+ wire in the ignition harness, you will not find another useable one under the dash.. yep.. seen this: "Oh.. only 1 ignition hot-wire? thats ok... i'll hook this one up at the fuse box" hahaha

Worst case, you run 1 extra wire through the firewall and connect directly to the battery.

This may be myth or not, I have never seen it happen but have heard stories of a bad unit install drawing too much power away from the ECM/BCM setting air bags off because of the voltage spike it sees. Even if its false, you still run the risk of burning a wire up and possibily catching the car on fire OUCH

if you look at the fuse rating on the red wires they are usually 30a.  so if you tied them together then you could be drawing 60a through one 12gauge wire, plus any constant power you need for relays and bypasses ect.  now thats only max power and most likely wont happen unless there is a short, but they give you two, so use them.