How to Wire the C5 Corvette Column for a GTM with ISIS...

A few people have asked this lately so we'd thought that it was best to have this up on the forum. 

For all of those guys building a Factory Five GTM with the C5 Corvette steering column, here is how you connect the ISIS MASTERCELL inputs to the column harness. 

Connect these pins to the MASTERCELL inputs:

• Pin D - Connect to ignition switched Ground
• Pins Z, X & W - Connect to Ground
• Pin V - Horn input to MC
• Pin R - Park lights input to MC
• Pin L - Low Beam input to MC
• Pin K - High Beam Input to MC
• Pin G - Left Turn Input to MC
• Pin F - Right Turn Input to MC

Depending on which turn-signal style you want (1-filament vs. multi-filament), refer to your configuration sheet for the specific wire colors.  You can download the ISIS GTM Configuration Sheet by clicking here. 

Many thanks to Shane Vacek at VRaptor Speedworks for sending us this information.