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Triumph TR3 - Petrol Guage Problems

Hello Everybody,

I have a petrol guage problem in my 1690 TR3. The tank is less than 1/4 full, the guage does not move off the "E" peg. I have 11.57 volts between the terminals, is this correct? Both wires are correct according to my Haynes Manual ( Green to one terminal, Green w/black to the other. All other electrical works, panel lights, wipers etc. The only thing that is not per the schematic is a Green wire from the guage to the wiper switch. If I do this, the fuse blows in the fuse block. The sending unit changes resistance as it goes up and down so I do not think this is a problem.

Any help would be greatly appreciated.
John Triska

I would be interested to know also, what exactly is the resistance at empty and full. And other points, if anyone has the info.
Tom

john & tom,
the wiring diagram in the haynes manuel is for a tr2,
note the wiring shown for the tail lite/brake lite.
look at www.britishv8.org click on british newsletter
then click on tech. tips. it will show a wiring diagram for tr2-4a.
on my 59tr3a there is only 2 wires off the fuel gauge.
a green/black from terminal"t" to the fuel tank sending unit and a green wire to the fuse box terminal terminal "a4".
the wiper motor has a green wire to fuse box terminal
"a4" and a black/green wire to the wiper switch. the
wiper switch also has a black wire to terminal"e"
on the regulator.
i checked the resistance on a new fuel sending unit.
the test meter showed full @ 21 ohms
empty @250 ohms
hope this will help,
payne
payne

Payne,

Thanks for the info, that is how I have it hooked up. Do you know if the meter itself needs a ground hooked up? The only ground I could think of would be through the bracket that holds the guage to the panel.
John Triska

Wow! thanks Payne. Now I have to write it down somewhere I won't forget where it is or lose it. Thanks again!

John, the guages are often grounded with a wire under one of the thumbscrews holding them on. I can't remember if they all are like that, but the wire has a ring connector with a small hole that fits the mounting screw.
Tom

This thread was discussed between 25/03/2005 and 29/03/2005

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