Thanks to those who took the time to answer. Turns out he physically mounted the new cap with one lead a little too close to chassis. At 2500 no problem, 3900 arc city! Thanks again, Sean -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com