Correct, the one on the bowl on a 7.3 filter head is the WIF light, the restriction switch is on the head itself, on 90 and up I believe(not sure though).
Ok i was jw, as in my 79 i hooked the WIF circuit to my cluster BRAKE light, and the GPs to the seatbelt cicuit. I was curious as even though ive had water in my fuel its never came on, and i know the circuit is functioning.
Thats what the switch does. It tells you the filter has a restriction and the injection pump is pulling so much fuel that the vacuum is present now in the line from the filter to the ip...
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