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I wired an LED to my fan's supply and it was on whenever the engine was running. It turns out that the fan in my car is not an ON/OFF affair, there is always some residual voltage and the speed is regulated by controlling the current (yes, the speed is smoothly increases with temperature). So until the coolant gets too hot there's not enough current to start the fan, but more than enough for an LED to shine. I've pondered about how to overcome this problem (bigger resistor? add a relay? inline ammeter?), but then desided that the fan is loud enough to be heard over my diesel's clunk-clunk-clunk anyway, so I gave up.
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is where you're going, not how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread
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