The process of checking a thermal gauge fuel or temperature instrument
system is broadly as follows.
1. Hand and eye checks (loose wires, loose switches and other obvious
faults) – all connections clean and tight.
2. Either t a known good 200 resistor in place of the temperature sender –
gauge should read full.
3. Or short fuel tank sender wire to earth – gauge should read full.
4. Check continuity of wire from gauge to sender – 0 to 0.5 Ω.
5. Check supply voltage to gauge (pulsed 0–12 V on old systems) – 10 V
stabilized on most.
6. If all above tests are OK the gauge head is at fault.
12.3 Global Positioning System ...
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