Phil2 Posted October 21, 2019 Report Share Posted October 21, 2019 The fuel and temperature gauges are not working on my TR7 (1981). Is there a common link? If this was my MK2 Cortina it would probably be the voltage stabiliser. The TR7 does not appear to have a voltage stabiliser. All fuses are in working order. The temperature sender has been replaced and all wiring is intact. Quote Link to post Share on other sites
DaveR Posted October 22, 2019 Report Share Posted October 22, 2019 There is no Voltage Stabiliser on the TR7 as it uses a bridge arrangement. The common ignition feed to the Fuel and Temp gauges would also supply the Tac and Battery Condition gauges. If these are working correctly then it may be a break in the flexy wiring on back of the instrument panel. Dave Quote Link to post Share on other sites
Melcoagain Posted October 22, 2019 Report Share Posted October 22, 2019 How are the guages not working? Stuck low, stuck at max, incorrect reading but changes as you would expect. incorrect reading that doesn't change. As Dave says the power is common across many gauges so unlikely to be the issue. Im no expert but:- The temp gauge suffers from:- No connection to the sensor (stuck cold), No power to the gauge (stuck cold), wrong sensor (changes with temperature but wrong values), Poor earth at the sensor (changes with temperature but wrong values), No earth at the sensor (stuck cold), short from gauge side of the sensor to earth (stuck hot). Fuel gauge. Much more complicated as it includes the warning lamp delay unit. However if the gauge moves when the ignition is turned on its probably either an earth issue, stuck sender or fault with the warning lamp delay unit. Quote Link to post Share on other sites
Phil2 Posted November 1, 2019 Author Report Share Posted November 1, 2019 TAc and battery condition are both working. Temp and fuel do not move from cold/empty, low fuel light does not come on Quote Link to post Share on other sites
Xseries Posted December 1, 2019 Report Share Posted December 1, 2019 this sounds very much like the printed circuit on the rear of the speedometer assembly. Quote Link to post Share on other sites
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