I have a 1992 camaro 5.0 TBI & i need to know what size the bolt is that connects the negative battery cable to the front of the passenger side head. Years ago i replaced the battery cable (because it was old & brittle) & I then grounded the new cable up near the alternator away from the engine block heat.

For the past few years sometime when i try to start the car the solenoid only clicks once, & if I turn the key off & then try to start it again (4 or 5 times) the engile will start. I replaced the starter over the past 2 years three times thinking it was the starter but it still does the same thing. Hot or cold, it doesn't matter. The car runs perfectly, i bought new 2 gauge battery cables, new alternator, new battery, ignition switch & still the same issue. I relocated the negative cable to the intake manifold & same issue. I have four 2 gauge grounds, 2 from the battery to intake manifold, 1 from battery to fender & 1 from battery to strut tower.

It starts normally about 70 percent of the time, but 30 percent of the time It clicks just once each time I turn the key.

I can only think that it must be that the battery ground in not actually bolted to the passenger side head as it was from the factory, & that is causing the problem.

Does anyone know what size bolt connects the battery ground to the passenger side head?

Anyone have any ideas?

If it's screwed into the cylinder head it would be 3/8-16 which would have a 9/16 head.