I was driving my 69 roadrunner this morning and I noticed my aftermarket voltage gauge was spiking all the way over at 18 volts. I then headed home but didn't make it. All power was lost after overcharging. I have a Powermaster 7419 externally regulated alternator and and my system has been converted to an electronic regulator. The in dash factory altmeter has been bypassed and wiring upgraded. Bulkhead connector was eliminated with straight through wire. This charging system has been working flawlessly for the past two years. Where do you recommend I start to locate the cause of my voltage spike? regulator, alternator , battery, ballast resistor, or faulty wiring? Thanks!