I have now put three voltage stabilizers in my '67 Series IIa. I've ensured that the units are attached to a nice clean area of bare metal for grounding and have attached power to the "B" terminal and the gauges to the "I". Each time I put a new unit in it works for a period of time and then suddenly doesn't and the fuel and temp gauge don't register.

Can anyone give me some advice on how to solve this problem?