JohnL455 wrote on Sat, 14 July 2018 07:36

The boost solenoid is out of circuit path during normal cranking. It simply provides a binding post for the 2 engine battery cables to join and continue. You cleaned "most" of your connections. Did you clean them with something like Caig D5? You did not clean all of them and resistance in series is additive. You need to also load test your engine battery. I believe you have multiple problems contributing. Is your hot starting a no starter engagement or slow labored cranking. You don't actually clarify. My 455 cranks faster than any GM car I have ever owned under all conditions and with a old starter.

John, I went through this in detail in my earlier post (see the first post here for a link), so I didn't want to repeat all of that again (ad nauseam and bore people who had already read it). In short, the problem I was having was at took a long trip from Seattle to Los Angeles. When I drove a long stretch 2 to 4 hours, and stopped at either a rest stop, gas, or Walmart, when I got back, I got nothing when I turned the ignition key (no cranking, no clicking, no sound). I had over 12.5 in battery power, but nothing. Everything else worked. I managed to get it started twice (once with a jump, the second time by me taking off the cables from the chassis battery). When I reached a destination, and plugged in or hooked up my battery tender, it would start without a problem (hot or cold).

When I was in LA, I went to Pep Boys and bought some battery cleaner and some protectant. I cleaned all of the upper connections (in the front compartments). I did load test the battery. I charged it to full, and then cranked it with a meter. It held at about 12.7 after cranking, and didn't drop below 10 that I could tell when I cranked.