[RICK LAKE]

Automan Are you running March pulleys? Are they under driven? This is problem #1. Alt is not spinning fast enough to both recharge the battery and running the whole electrical system. 65 amp will run a basic cobra car without alot of extras. You need to take the ALT to a Autozone and have them check the MAX output of the ALT. If it's passing the test Want to see 60 amps min. This will work if you are at crusing speed, say over 1,500 rpms on the motor. Wouldn't run everything at 1 time.
Pulleys, if you are running any underdrive pulley setup on the crank shaft, this is another big problem. The Alt is spinning too slow and can't charge the system and the battery at the same time. You may be getting only 25-30 amps and need a 40-50 charge to keep everything with the correct voltage to system. You should have a 1-1 ratio on the crank pulley and waterpump pulley and about a 2-3" Alt pulley. Underdrives are for racing, 1/4 mile cars, or show cars. They work boardline when cruising( depending on rpm range).
Wiring last thing, Make sure you have a fusable link in the output cable of the Alt. I like a 150 amp fuse and #8 wire in copper.
I run 3 coolant fans, 3 blower fans for heat, 2 fuel pumps, ECU, fuel injection system, Lights, MSD igntion. I have gone to a PA preformance setup. They sell a kit that hooks up to your Orginial harness with voltage regulator box and heavyduty output cable. I went to a 95 amp setup and it powers everything. You CAN'T run a amp gauge with this setup. IT melts the insolators on both SW and Smith gauges over time. You get one hell of a fire too. You don't want to let out the smoke in this curcuit. Check into PA for their cobra kit. LIfe time warrantty on their system. Racing 5 years, no problems. Good luck. Rick L.