2010 gmc seirra hybrid 6.0 won't start but all lites and everything works fine. But there's a constant clicking up by fuse box under hood
constant clicking means the solenoid for your starter motor is either:
- Defective (not likely- since the click means it was working momentarily)
- Not getting enough power to stay on (battery is good for light, not for amperage of starter motor)
- Turns itself off due to overload amperage (seized starter motor/engine)
The clicking is commonly just an indicator of a dead battery; the solenoid clicks- connects power to the huge drain of the starter motor- then, as the amperage draw "browns out" the battery, not enough power is left to keep the solenoid on- clicks off. power drain is gone- solenoid clicks back on- (repeat until battery is REALLY too dead to even get the solenoid to click)
Its important to note that interior lights, dashboards, and stereos draw very little power, an are not good indicators of battery charge.
I would recommend getting a jump-start from somebody, before doing anything more intense. After engine is running, maybe bring it to a mechanic to check its battery charging circuit.