drischnie Posted May 15, 2015 Share Posted May 15, 2015 on my MY88 RX Coupe the low fuel warning light doesnt work anymore. Does anyone know if theres a extra switch ore something for that light? Quote Link to comment Share on other sites More sharing options...
Sapper 157 Posted May 15, 2015 Share Posted May 15, 2015 Mine doesn't work either. I guess that's electronics for ya Quote Link to comment Share on other sites More sharing options...
skishop69 Posted May 16, 2015 Share Posted May 16, 2015 It is run by a thermistor in the fuel tank at the bottom of the sending unit. The fuel covering it keeps it cool and it has high resistance so no current flow. When the level drops below the thermistor, it heats up and resistance goes down. Current then flows and the light comes on. You need to determine if the light or the thermistor is bad. Use the schematics and apply proper power/gnd to the feed circuit of the light and see if it comes on. If it does, you'll have to drop the tank and pull the sender. The thermistor can be replaced if you're fairly handy and can find the proper rating. Quote Link to comment Share on other sites More sharing options...
Dinky26 Posted May 16, 2015 Share Posted May 16, 2015 So if the light is on constantly it's probably the thermistor in the tank? 1 Quote Link to comment Share on other sites More sharing options...
skishop69 Posted May 16, 2015 Share Posted May 16, 2015 Correct, or you have a short somewhere. Quote Link to comment Share on other sites More sharing options...
wagonist Posted May 19, 2015 Share Posted May 19, 2015 You shouldn't need to drop the tank. There's an access plate through the rear floor of the car (though this might be different for the coupe). Lift the carpet & check for a small access panel near the right side. Does the coupe have small pockets down the sides, lower than the boot floor? Cos the wiring comes into the car from behind a small metal guard screwed into the right side one of these. 1 Quote Link to comment Share on other sites More sharing options...
Loyale 2.7 Turbo Posted May 20, 2015 Share Posted May 20, 2015 on my MY88 RX Coupe the low fuel warning light doesnt work anymore.... I wonder Why Nobody suggested yet that such "no Light" issue, could be caused Also by a Burnt T-5 Bulb on the instrument Cluster... Kind Regards. 1 Quote Link to comment Share on other sites More sharing options...
TomRhere Posted May 20, 2015 Share Posted May 20, 2015 That doesn't work on my '88 Wagon either. Haven't looked for cause yet. Good info in here. Do know, that all of the BRAT's I owned had this issue. Found the connectors for the sending unit wiring to be corroded, easy repair. When I dropped the fairly new tank out of the '92 parts Wagon, I found one of the wires had broken off the sending unit. Quote Link to comment Share on other sites More sharing options...
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