cubezilla

iTrader: (6)

got a 2000 silverado & i put a 6.2ls3 in it about 6months ago and all was fine.

I dont drive it daily so it sat for about 2 weeks, and i keep a battery tender on it, so when i went to drive it , the engine started but very slowly as if the battery was dead, truck ran fine but when i parked it again i had nothing from the engine, radio,headlights,fans,cluster all work and where lit up but the engine wouldnt start...

Now, this morning i checked my grounds, all are fine..
1. Replaced battery with a brand new one
2. Replaced starter with a brand new one
3. Replaced the Ignition switch (wiring harness) with a brand new one

I turn the switch over and the engine may spin over very little if any then (Click Click Click)

I put a booster box on it an it fires right up, and runs fine!!!! Cut it off and same thing...... Click Click Click ????

I'm completely lost???

nomasterase

iTrader: (4)

If it starts normally with a booster pack but not with the battery theres most likely something wrong with the connections or the battery is not up to the task. I know you say its new but that doesnt mean its good maybe you should have it load tested