path1 wrote:
...
What I did have of Harbor freight was 10/2/50 amp 12 volt.
...
I have one of those. Here is how it works for me.
I raises Volts to 14.7 and then shuts off. That is basically a 'bulk' charge. Next, it shuts off and waits for 12.95V where it restarts and goes back to 14.7. This second stage repeats.
It is OK as a 'bulk' charger and then you disconnect it. I don't let it stay connected as that next ON/OFF stage is no way to maintain a battery. Plus, the 2A setting is harmful if you have a higher concurrent draw as it will NEVER go to float and could lock on at 14+ Volts.
HTH;
John