If you know you are on G1, I would put it on channel 3 or if you don't have a DC light for channel 3, put it on 150 and unplug it now, since your cables have been corrected, and see if it will give you the correct maps. It probably wasn't giving you information correctly before because it wasn't getting the proper signal through the lines, since they were hooked up incorrectly. Now that they have been corrected, I would give it a try?
Al