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Discussion Starter · #1 ·
I Installed a new oil pump and sending unit as part if the engine make over,,, I spun the pump with a drill and had an ohm meter attached to the oil sending unit,, (my car has idiot lights).. the sending unit showed low resistance when read with the meter when started then when I spun the pump,, it went open,,as I figured it should,, but after I stopped,, the switch still shows open,,I don't understand,, I figured it should go back to a resistance thus allowing the light to come on when the engine is not running... does this sound correct?? thanks
 

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An idiot light sending unit doesn't give a variable resistance. It's simply a pressure switch.

IIRC, they close at 5 psi and less. It should show up as a zero ohms once the pressure drops under the set point.

Phil
 
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