Ground is good, got 12 volts but missing 7 volt, research says the 7 volt comes from the 12V through a voltage regulator/limiter. Can’t find the limiter, supposed to be on the back of the printed circuit board of instrument panel. Problem started when I replaced the panel bulbs with LED’s, I had also replaced the glow plug relay, controller and shutoff timer relay at the same time. Any help would be much appreciated!!