Did you ever have any resolution to your clicking?

I've fought this issue since I bought the Z6EX in 2020.  I've now replaced 2 solenoids over the years but it seems like there is something else amiss.  I'm getting a new battery currently as this one is 3 years old.

I too can't start with a battery pack but a car will start it and keep in running but it is shutting off when the battery charger cable is disconnected which tells me I also have an alternator issue or some connection that isn't keeping. 

Did you check with the ignition and did this have any effect?  Appreciate any info.