there are two relays that might be involved. The EEC/ignition relay, triggers the Fuel pump relay, which sends power to the inertial safety switch.
How to check a fuel pump relay How to test relay switch - Ford Bronco Zone Forums Fuel pump and sending unit wiring diagram expedition 5.4L http://www.ford-forums.com/engine-dr...tml#post137679
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BroncoJoe19
2006 Alt Fuel Jeep (electric)
'98 windstar 3.8L
'99 Crown Vic 4.6L
'90 Full Size Bronco 5.0L
I'm not a professional mechanic, take my suggestions with a grain of salt, or a cup of coffee
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