Measure the resistence.

[Swed-Suburban]

Hi, I wounder if you can and how much should the resistence be on my heater in the dieselfilter case model FM 100, on my Suburban 1994 6,5L.
"Fuel-Heater inside the fuelfilter model FM 100"


// Magnus

[More Power]

The heating element is thermostatically controlled, usually activated at +20 degrees F or below. So, at warmer temps, the resistance will be infinite (meaning an open circuit). Bypassing the thermal switch should produce a very low resistance reading (meaning a nearly closed circuit).

Jim