[FunnyGuy]

2004 Saturn Ion Redline 136k miles. No upgrades. I've followed alot of threads on here about fuse #10 I've changed the charge air pump, re did the intake/MAF, re ran the O2 sensors and tested the evap solenoid. Fuse #10 still opens I took it to the dealer they said it was a bad underhood fuse box. I replaced the fuse box and fuse #10 stayed closed and everything worked awesome for 24 hours and then BOOM back to square one fuse #10 is open again and I am completely stumped and I dont want to spend another $150 in diagnostics. (I unplugged the charge air pump fuse #10 still opens)

 

[FunnyGuy]

I noticed that the fuse pops when the car cycles ACC 2 on the IGN switch

 

[Rebel Redline]

It's an '04.

Even money your intercooler pump wiring has reversed polarity.

 

[FunnyGuy]

It's an '04.

Even money your intercooler pump wiring has reversed polarity.

I unplugged the intercooler pump and the fuse still opens does that matter with reversed polarity also I notice the liquid is flowing to the right inside the fill neck

 

[REDLINE1313]

Should be flowing left. Check the wires. If they are reversed it can toast the pump.

 

[FunnyGuy]

It turned out to be the wire to my upstream o2 sensor had rubbed raw and grounded off my engine because the engineers thought it was a great idea to run a wire between a metal vaccum line and the engine. Re-routed and replaced everything works fine.