Expy wouldn't start
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Joined: Dec 2018
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Expy wouldn't start
Hello new member, 04 expd 5.4. Truck has been running great ,sat for a couple of days because of christmas. Long story short ,tried to start it up it cranked over just fine but wouldn't start. After a little googling saw a video about inertia switch , pressed it and it started right up!! Does anyone know why that would trip?
Thank you in advance for any suggestions.
Thank you in advance for any suggestions.
Fleet Owner
Joined: Apr 2008
Posts: 24,316
Likes: 5,127
From: 0,0,1
That switch doesn't "trip" like say a circuit breaker would. Instead it's meant to shut down the fuel pump in the event of a rollover. So for the switch to "trip" it would have to be turned upside down. If it happens again I would replace it.
Fleet Mechanic
Joined: Feb 2011
Posts: 1,812
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From: Thousand Oaks, CA
I thought the switch responded to a shock - https://en.wikipedia.org/wiki/Inertial_switch
Fleet Owner
Joined: Apr 2008
Posts: 24,316
Likes: 5,127
From: 0,0,1
Makes sense to me since such a jolt would cause a reversal a gravity for a few 10ths of a second as the truck goes up then down.
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
It's an impact-sensitive switch that is supposed to "trip" (like a circuit breaker!) when physically shocked. You should be able to trip it with a very firm slap to the panel where it's mounted.
Back in my SHO days, I had a tool box in the trunk of the ole '89. I went around a corner a bit too fast causing the toolbox to slam into the side of the trunk where the inertia switch was located. Had to coast to the side of the road, get out, open the trunk, and reset the switch to continue down the road.
Back in my SHO days, I had a tool box in the trunk of the ole '89. I went around a corner a bit too fast causing the toolbox to slam into the side of the trunk where the inertia switch was located. Had to coast to the side of the road, get out, open the trunk, and reset the switch to continue down the road.
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