Originally Posted by Teamfour
Sounds like dirty metal and/or bad ground. You have to make sure that all metal being welded is ground to bare metal and clean. Also make sure the metal where you attach the ground clamp to is bare and clean.
Ground should be good- I ground down a spot on the tank leg with an angle grinder to bare metal. I thought I cleaned the weld area well enough between sand paper and angle grinding. I will see what more I can get off tomorrow and report on the results.
Thanks for the feedback!