I was in the garage earlier and answered my own first question by looking at the back of some spare side clocks - the voltage regulator/stabiliser is on the back of the side dials at the bottom connected to/pushed into the printed circuit - in this case it has a B, I and E terminal
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The B and I have the same function as a centre dial two terminal regulator and the E is in the earth part of the printed circuit so leads to a B-lack earth wire
If you have 12V to the printed circuit from the W-hite wire (do the ign and oil warning lights work?) then there should be 12v to the regulator unless the printed circuit is broken
If you have 12v at the B terminal you should then see 10v off the I terminal (to the fuel and temp gauges) if 12v at B but no 10v at I then the regulator is dead
If you have 10v at the regulator I terminal you should then find 10v at the GB G-reen & B-lack wire terminal - if no 10v then the gauge or printed circuit is broken
(You could also check for 10v at the GU G-reen & bl-U-e terminal from the temp gauge which might tell you something about the it being the printed circuit if no 10v at either)
If you have 10v at the wire terminal on the dials but not at the tank then the GB wire is broken somewhere in the loom
If you have 10v at the sender but no fuel gauge reading then the sender is bust or the earth off the sender is bad - you can check earth continuity easy enough to eliminate that
Hope this helps its just elimination