what is this plug

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496bb

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So, going through hose replacements and general maintenance on this old girl that I aquired awhile back.

Not sure what this dangling plug is for, don't see a lone plug that should go into it. 87 454 TBI. Not totally sure what these two relays do either. But, trying to determine what this particular plug is and should it be dangling or does it have switched power or?????
 

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94_6SpeedZ

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I can't say for sure since my 76 is carbureted, but i have a 94 Camaro Z28 with what appears to be a similar plug. My plug is meant to test the fuel pump. I can apply 12 volts to it and the fuel pump will run. I'm guessing your TBI may have something similar.
 

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