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24V Lightweight temperature gauge


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I've recently acquired a '79 Lightweight FFR and the coolant temperature gauge goes straight up to the maximum when the ignition is on. The previous owner fitted a new sensor/sender, as have I, with no change.

I've read up a bit on this, and earthing the wire to the sender flicks the gauge straight into the red. As I understand it this means both the gauge and the wiring are fine, and its likely to be the sender. However this is sender No 3 (luckily not expensive) so I don't believe they are all faulty.

Has anyone got any other ideas? I bet its something really simple (he hopes lol).



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Quite possibly, look for an extra resistor fixed between terminals, also, you can inadvertently bypass it by connecting the wire to the wrong point!

True 24V gauges are pretty rare to get hold of...

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