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Did some upgrades and now my truck won't start


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Hey everyone. 

 

I did a headlight harness upgrade and a "big 3" upgrade today. The headlights and electrical all work when I turn the key, but there is nothing from the engine. I double checked all my grounds and can't figure it out. Any ideas? Thanks. 

 

This morning I tried jump starting the starter which sparked. Checked all my fuses, which were all still good. I'm at a loss. 

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3 minutes ago, HOrnbrod said:

What's a ""big 3" upgrade?  Did you mess with the ignition switch?

 

Didn't mess with the ignition switch. 

 

This is the big three upgrade: 

 

"A good, cost-effective improvement is to perform the "Big Three" electrical upgrade. This will vastly improve your vehicle's electrical system, allowing more current to flow easier to all components. This upgrade replaces or augments three key cables in the electrical system with 1/0 or 4 gauge wires: the battery ground to chassis wire, the chassis to engine block wire, and the alternator plus to battery plus wire. This increases your electrical system's current flow capability, ensuring a more consistent voltage under varying demand conditions." 

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34 minutes ago, mark 39 said:

              Good, you fixed it. What was the cure?

 

I'm actually embarrassed to say, but my negative battery cable wasn't snug enough... 

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