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It's a lot easier to just troubleshoot the relay. It's not complicated. Using a voltmeter (good) or test light (better), check for 12v at the top (input) of the relay. (Big 1.) Using a voltmeter (good) or test light (better), check for 12v at Small 1. If you don't have it, there's problem...

Your GP relay has 4 connections. Two big, two little. Here's what they do: Big 1. 12v from the battery. Big 2. 12v out to the GPs. Small 1. 12v from the ignition switch. (Could theoretically be from battery.) Small 2. Ground, switched by the controller card or by a switch that...