Re: [DML] Constant tripping of the cooling fan breaker

[Martin Gutkowski <webmaster@xxxx>]

Hi Ken

With a multimeter set to Current (most DMMs will do 20A), using the 
fan-fail socket, and the fan relay socket next to it (ie un plug the 
fanzilla) you can measure the current drawn by each fan. I expect you 
will discover neither draw more than 15A (both mine are fused at 15A and 
the fuses are fine).

The way a circuit breaker works is a bi-metalic strip - it works like a 
thermostat and breaks contact WHEN it gets hot. Extra heat can be 
generated by dirty contacts to the breaker itself, a nearby heat source, 
and a lack of ventilation. Ventilation you can't do much about, but see 
if anything next to it also gets hot, and clean or even re-crimp the 
connectors on it.

Martin
#1458

Montgomery, Ken wrote:

> Hi gang,
>
> I've come across a problem I've not been able to solve. The circuit breaker
> to the cooling fans keeps tripping when the air conditioner or the otterstat
> has them switched on. It happens after the car and fans have been running
> for a while and the breaker has become hot. I thought I may have just had an
> old or defective breaker (40 amp) but the replacement does the same thing. I
> have a FanZillia, the fuses on it are holding and both fans turn easily. Why
> are they drawing so much current? I'd just jump the breaker and rely on the
> fuses but That's just not a good answer.
>
> Does anyone have any suggestions?
>
> Ken