Any autoelectricians out there

[jasonhepp]

A good one for an autoelectrician.

My interior fan stopped working a while ago. I pulled it out, connected it directly to a battery and works fine. Getting 12V at the connectors to the fan but when fan connected and turned on the voltage drops to about 0.5V and obviously doesnt have the grunt to turn it over.

It would appear that I have a large resistance in the line such that once the fan tries to grab some ergs it drops the voltage available for the fan.

Does anyone know where I should start looking ??. Wires are very difficult (impossible) to get to.

Any help appreciated.

Thanks

Jason

[dr.hess]

Have you checked the ground?

Dr.Hess

[jasonhepp]

Well its on the carport but I dont see anything, it is a bit dirty though.

Only joking.....

Yep earth seems to be fine in that its connected, is there any way to tell ??

Jason

[paul c]

Hi,
Check the ACTUAL Ground at the fan connection has continuity to the the chassis ground (or any other known ground).

If you think there is resistance/voltage limitation in circuit then looking to the fans speed controller/reostat might be worth a shot - as in normal operation this is what it does.

(if you are sure on the connections you could bypass this to rule it out and confirm the wiring is all ok)

I do not have any drawings to hand.

PAUL C

Electrician (non auto!!!)

>> Edited by paul c on Monday 12th April 11:52

>> Edited by paul c on Monday 12th April 12:05

[janszott]

Don't use a multi,eter to do testing. Most have a very high impededance that will trick you into thinking you have a good connection. If only one strand of wire is still connected, it looks fine to a multimeter.
Use a 12v light bulb on some leads. Much better tester.

Jan

[cnh1990]

Go for the switch and check it.
An easy check is to bypass the switch by jumpering the wire around it.
Calvin


>> Edited by cnh1990 on Monday 12th April 14:27