High speed does not use the resistor so that can't be the problem for
that speed. Only low and medium speed go through it. Don't overlook fuse #1,
on the left end position of the main fuse panel. All 3 speeds use it.
Should be 30 amp.

With the radiator temp switch wiring plug pulled off the switch, jumper
any 2 pins of the wiring plug with small needle nose pliers. 2
combinations should run the fan, 1 at low and another at high speed.
Middle speed is only run by the A/C.

Another common failure point is the ground lug for the brown wire coming
from the fan. It plugs into the grounding star behind the main relay
panel. Many grounds plug in there and corrosion is a major issue on them.

Mark

Paul Connelly wrote:
> Hi Volks,
>
> Next question... does anyone know or can check out with a meter what the
> resistance should be on the resistor behind the drivers side headlight for
> the radiator fan. I've lost the fan. Checked out the temp switch and its
> fine - both stages switching to open circuit at the correct temps (ish).
> Checked the fan and it is buzzing just fine with 12v applied direct - leaves
> the resistor and the relay if the archives are correct.
>
> Measuring at the back of the connector plug I get ~ 6 ohms across the outer
> terminals, ~ 4.3 ohms across the two terminals "closest" to each other and ~
> 1.3 ohms across the "spaced apart" terminals.
>
> Just wanted to check it out to eliminate it or confirm it as the culprit...
>
> TIA
>
> Cheers, Paul.
> 1986 Syncro Westy - Hummingbird
>
>