Evening all.
Just a quick one. When I get up to a reasonable pace, my fan light comes on. The switch is back lit so I now if I've left it on or not. So at speed the fan becomes a genny. Will this cause any problem long term with my electrics? It doesn't seem to have done so thus far. Although my battery does seem to die a bit quickly between uses, but the car only gets used occasionally and then for shortish trips, so that's not unexpected.

It depends on how you've wired it up, I guess it shouldn't do any harm but if it were my car I'd be tempted to put a diode in line just to be sure.

God only knows how it's wired. I didn't build it, and who ever did the wiring was a plonker. As far as I can tell, it's wired up as a switched live with a fixed earth near the fan. I'm not even sure if there's a relay in there either!

Oh, if I do fit a diode, any idea how large a current a fan can produce at say 120 mph? Just in case I go near a track, as I don't want it blowing up on me!

[Edited on 23/12/08 by DIY Si]

Not much help, but I'm sure there was some stuff on here about that a couple of years ago (maybe more)

Search might come up with more answers, but from what I remember, a diode was involved then too!

ATB

Simon

Look on the bright side, if your garage is draughty it will charge your battery.....

I wired my fan via a relay, on the unswitched side (so that it would cool the engine down when the ignition's off). This means that either the fan's on and being driven, or it's off and disconnected from the live circuits.

Mine does it too, led light. Doesnt seam to have caused any issues....