I run a cap, just for the peace of mind. They are so cheap nowadays, might as well. I've done the big 3, optima, bigger alt, etc. Still seemed like less dimming at idle with system going.n Plus, they look cool
The problem with a cap is you don't know when you're clipping. It also puts undue stress on the electrical system that is already inadequate.
1969 Chevy RCLB C10 350/TH400 SOLD
2007 Chevy RCSB 4.8 4x4 LS SOLD
2008 Chevy RCSB 5.3 4x4 LT SOLD
2010 Chevy CCSB 6.2 4x4 LT SOLD
2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
2013 FORD CCSB F350 6.7 Powerstroke 4x4