Re: Bypassing the ignition - Saab 900 Bulletin Board - Saabnet.com
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Re: Bypassing the ignition
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Posted by Justin VanAbrahams [Email] (#32) [Profile/Gallery] (more from Justin VanAbrahams) on Wed, 4 Apr 2018 11:07:45 Share Post by Email
In Reply to: Re: Bypassing the ignition, turbocon86, Wed, 4 Apr 2018 09:29:36
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I think you're right - the only thing it does is engage the door chime relay but it *might* interact in some way with the Saab Guard alarm, but don't quote me on that.

The ignition switch does two basic things:

1. It connects the grey wire (which comes straight from the battery) to all the other circuits in the car (in the picture the white/grey, green, white/green, and red wires

2. It temporarily connects the grey wire to the starter solenoid to spin the starter "in the picture the red/yellow wire

As long as you connect grey to all other wires with a switch, you'll power everything. You just need something to momentarily connect battery to starter.

Be aware that the factory switch has "load reduction" feature which disconnects certain non-essentials when running the starter so maximum power is available to the starter. It's probably not important in 2018, but it is a factory feature.

I use this thing to test individual circuits in the car, and to start one when the key is not available. Each switch connects to a specific circuit - turn them all on, press the button, the car starts.

posted by 12.195.130...


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