Relay needed for 2nd starter wire Subaru Forrester '10

Question

I've got a Python 4105 remote start with a Evo All. The wiring connection diagram has Starter1 out and Starter2 out, both positive, going into the python. Problem is there is only one wire for Starter out in the python. How do I do the second starter wire? I've seen some on the 'net say you need to wire it with the fist with a relay, but it has not been on Subarus. If that is the case, what type of relay and how do I wire it with the starter wires? 

Also, the python had two fused wires for 12 volt input, but there is only one wire on the car's ignition harness for 12v. Do I wire all three together, or just not use one of the inputs on the python?

Answer 1

Not sure if you'll get comments from Fortin staff as the question pertains to the Python product. Another place that could help you is http://the12volt.com. I can give you brief guidance though. Yes, you will need a relay to connect the 2nd starter wire. A standard Bosch style automotive relay is what you'll need. The connections: pin 70 to +12V fused, pin 30 to car's 2nd starter wire. These need to be heavy gauge wires as they will provide power for the 2nd starter wire. Next the relay coil: pin 86 +12V fused, pin 85 to the (-) 200mA Starter Output wire from the python unit... As for the +12v connections, you will need to hook up both of the +12v python wires to the +12v in the car's ignition harness. Otherwise the remote start won't work properly. And of course, this includes the +12v for the 2nd starter relay as well.

Comments

Thanks for the help.

I found the Subaru install instructions for the Evo One and there is a relay used for the second starter wire as follows, the relay is different than the one mentioned above:

Starter2 to 30

85 and 87 to 12v+ fused to evo

86 to -starter outpout on the evo.

Will this connection work for the python? I've got this relay already ordered. Wish I had just the One vs the Python and All, the reseller told me I needed the two devices.

 

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Yes, that will be fine. The only difference from what I posted earlier is that 85 & 86 are reversed. This is perfectly fine since 85 & 86 are the coil contacts and usually not polarity sensitive unless mentioned on the relay (very rarely will a relay coil be polarity sensitive if it has a suppression diode built into it). Other than that you can hook it up as shown in the EVO ONE guide, instead of the EVO wires, you would use the Python wires. If I got the correct manual, the (-) 200mA Starter Output wire should be purple p3 on the satellite relay.

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I'm trying to figure out the best way to wire in the relay with the least amount of dismantling the current connections.

1. Is it important that the 12v line from the relay connect between the fuse and the python, as opposed to between the harness and the fuse?

2. if so, can it connect to just one of the two 12v lines that connect to the python? The single 12v wire from the harness connects to both 12v wires at a 3 way connection.

 

Again, you have been a big help, almost done!

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1. You could do it either way. If you connect past the python fuse, I would still add my own inline fuse just to protect the wiring in case something goes wrong.

2. You could do it this way. But first take a look at the wire sizes. Are the two python 12V wires roughly the same gauge as the 12V in the car's harness? If they are the same size then you can go ahead and piggy-back to one of those two wires.

Say if the python 12V wires are quite thinner, then you have to think about whether that section between the harness connection & the relay power connection will see too much current at peak draw.

In this case it may not actually be an issue, but I mentioned this as it's a good thought process to have in general when wiring.