recently i installed a new tail lite harness, power window harness, turn signal switch, nuetral safety switch, new 160 speedo. everything that was replaced works fine. we were adjusting the windows, and when while doing that we left the key on in the on position. apparently by leaving the key on for a period of time it burned up coil. i replaced the coil and still got no spark, replaced accel pointless ignition module, cap and rotor, and still no spark. i have 12.58 volts at battery but only 11.50 at coil. is my igition fried? or is it a voltage regulator problem?