Anyone know what sort of current a Sciento heater fan draws?

My mates is busted, the fan doesn't spin and they are getting cold on the commute.

I've tested all the usual things; switch, fuse, fuse board. maxi fuses and I still can't make it work.

If I put current directly to the fan motor it does work.

I'm thinking the best course of action is a rotary switch, in line fuse and wire to the batt/fan.

So I need to make sure a get a switch that doesn't burn out.



Any thoughts?

if the fan works when directly powered then, but you've tested all the switch gear up to it then you must've missed something - i would suggest more methodic testing, and find the problem rather than add a switch that isn't needed. But to answer your question, around 15a

Well it is related to this post;

https://www.fiatforum.com/cinquecento-seicento/150015-interior-fan-ciggy-lighter-not-working.html

Which I never managed to fix either. I ran new wire with an inline fuse and 12v socket. But now it is cold in the morning she is not so happy!

Is the fan motor not earth switched?

Cheers

PD

How does trhat change things?


Also, does the fag lighter/fan share a relay? If so which one?

I don't think that the fag lighter/fan have a realy, although I don't have the wiring diagram in front of me.

Earth switching makes a hell of a difference, obviously.

Does the fan run on the full speed setting, or is it dead on them all?

Cheers

PD

No sign of life on any speed setting. Also it went from working on all speed settings to not working on any.

I'm not understanding the implications of earth switching, care to explain?

Basically the implications are for how you test. If the fan works with current directly to earth and 12v (by passing the switch) and you get 12v at the terminal positive when the other end of the meter is earthed, but not when it's on the negative connection, wherever the switch is, then you have an earth fault.

These things have a resistor pack -- about the size of a swan vesta box, usually green -- up there alongside the heater. That could be the issue.

Would that failing, take out the fag lighter?

Shouldn't. Take a look at the maxi fuses by the battery.

Bump !

My fan does not work on any setting nor does my fag lighter.

When I disconnect the two pin socket from the motor there is 12V.

Does that suggest the motor is faulty ?

How would I go about removing it ?

Fan or resistor pack. Note the earth switching -- 12v across the terminals, or 12v from the +ive and a good earth?

Something wierd is happening -- check maxi fuses, all fuses, etc. If the lighter doesn't work, suggests fuse to me.

You could always put 12V across the motor to check its OK.

Cheers

SPD

On the side of the motor housing at roughly 7 O'clock is a two pin connector. It is the plug going into this connector that gives me a reading of 12V when the fan is on full.

Surely this would point to a faulty motor ?

Possibly. As RC suggests, 12v across the motor will see if it's working or not.

Nope, struggling with that a bit, if I have 12V at the plug that goes to the motor, why would I bother finding another 12V feed ?

Jules Sei said:

Nope, struggling with that a bit, if I have 12V at the plug that goes to the motor, why would I bother finding another 12V feed ?

Click to expand...

You probably don't need to. But it's always better to just wire up a couple of cables to the battery terminals and test stuff directly (or as directly as possible). And (big and, this) I don't know exactly how you measured the 12v.

hi i seem to be having the problem with my seicento too.
unzippy did you find the fix?