Welcome to the forums. You should have a red wire running from the positive of the battery to one of the 30 amp main fuses and the other wire (red/yellow) should be running from the positive of the battery straight to the other 30 amp main fuse. According to the wiring diagram, there's nothing in between the battery and the main fuses, but a connector. I would check that connector for a bad/loose connection. Also, check for a bad connection where the wires come off the positive battery post.
BTW, you should have 12 volts on both the wires at the keyswitch.
BTW, you should have 12 volts on both the wires at the keyswitch.
