[TR] Oil pressure sending switch

[davgil at aol.com]

Wanted to validate my understanding of the low oil pressure sending switch on a 1976 TR6.  I noted that a wire was not hooked up and when I hooked it up, the oil pressure warning light came on and stayed on when the car was cranked.  In the 25 years I have owned this vehicle, I have never seen the low oil pressure light on so didn't realize that there was a problem. I put a meter from the switch to the positive battery terminal.  When I crank the car, there is 13.7 volts, regardless of the oil pressure.  My sense is that the switch should only ground under very low oil pressure, and that when suitable pressure is achieved, the ground is disconnected.  My assumption is that there is an internal short in the switch which is keeping the ground connected regardless of oil pressure.  Would this be a correct assumption, or is there another issue?  David Gill1976 TR6
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