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Re: 18 volts at the battery (again)!!!!
Your ammeter indicates the load that is on the system. A short is seen as a "load" by the ammeter and will peg or at least cause it to indicate a high current draw. I'd start by pulling and reinstalling the fuses one at a time and watch the ammeter. A fuse will blow if it's rated current is exceeded. It may be an "unfused" circuit. There may be a chaffed wire somewhere that's causing an intermittent short to ground. Inspect your wiring and fuse block. I don't think it's your alternator install. Ever heard the story of the guy who replaced a blown fuse in his jeep with a .22 long rifle shell?
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.   
Last edited by Sweet72; 01-22-2008 at 11:39 AM.
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