oh here is a nice compact (ha!) model

http://www.criticalvelocity.com/item.php?itemid=spdc03

mind you, it could be hidden somewhere remote, and the 0-5 VDC signal used to control (ie small potentiometer behind stock switch)

here is a smaller one

http://www.bakatronics.com/shop/item.aspx?itemid=880

but only 8 - 12 V

David, know off hand what the voltage ends up being after going through the low speed resistor?

alistair

On 2013-04-08, at 9:37 PM, David Beierl wrote:

> At 10:24 PM 4/8/2013, Alistair Bell wrote:
>> Didn't someone propose a PWM speed controller retrofit for the fan motor? Was it you David B.?
> 
> Not me, though nothing wrong with the idea I can see.   Has to be able to drive ~15 amps though.
> 
> Yrs,
> d