Put fass fuel pump on my truck this week, and then realized my horn and speedometer don't work, and I have driven truck once before today after puting on pump and I think the speedo was working ? But I can't remember looking or not … what's your thoughts
I know it sounds obvious, but check your battery connections. I had a huge headache regarding my lift pump, and after an hour or so of hassle it turned out to be a loose connection.
Did you check the connections? Everything can work and not work intermittently if the connection is loose, just depends on when a connection is made.
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