That is your radiator fan resistor that gives you the low speed on your
fan.  If you turn on your AC and your low speed fan doesn't
automatically come on this is bad.  I have them available for $48 if you
need one.

Ken Wilford
John 3:16
www.vanagain.com

gneiss9 wrote:
> While changing headlight adjusters in my '91 Westy I noticed the
> ceramic relay-type unit living behind the drivers side low-beams.
> What is this part called and what function does it serve?
>
> Thanks,
> Trevor Reynolds
>
> gneiss9@gmail.com
>      
> Fahrvergnügen!
>