PA28 PLT AFTER LNDG TAXIES INTO A MIL RESTR AREA AT MGM.

Narrative

I WAS ON A VFR FLT FROM DELAND; FL; TO SHELBY COUNTY; AL. I MADE A STOP IN ENTERPRISE; AL; FOR PAX PICK-UP AND FUEL. FUEL WAS UNAVAILABLE; SO I CONTINUED MY FLT TO MONTGOMERY; AL; AND LANDED TO REFUEL. AFTER LNDG; I WAS TOLD BY TWR TO TURN L ON TXWY A5. I ASKED TWR FOR TAXI TO NEAREST FBO WITH AVAILABLE FUEL. I WAS TOLD 'TAXI TO RAMP' THERE WAS A RAMP DIRECTLY IN FRONT OF ME; SO WITH NO OTHER RAMP INSIGHT; I UNDERSTOOD THIS TO MEAN TO TAXI STRAIGHT ONTO THIS RAMP. I CONTINUED MY TAXI FORWARD ONTO THIS RAMP FOR ABOUT 50 FT UNTIL A HANGAR WITH ALABAMA AIR NATL GUARD WAS VISIBLE. I QUESTIONED THE CTLR AND HIS REPLY WAS; 'NO; I'M SORRY; I SHOULD HAVE TOLD YOU TO TURN R ON TXWY C; ARE YOU BEING MET BY ANYONE?' I WAS MET BY GUARDS AND MY ACFT WAS SEARCHED. I WAS RELEASED AFTERWARDS. THERE WAS A LIGHTED SIGN DESIGNATING THIS AREA AS ANG; BUT MY SIDE OF THE SIGN ON A5 WAS UNLIT AND IMPOSSIBLE TO READ. ALSO; THE TXWY C SIGN WAS SO DIMLY LIT THAT IT WAS UNREADABLE BEYOND 30 FT. DISTANCE FROM A5 TO TXWY C WAS APPROX 400 FT. THERE WAS NO SIGN ANYWHERE DESIGNATING THIS AREA AS RESTR. EVEN THE HANGAR WITH AIR NATL GUARD ON IT WAS OBSTRUCTED FROM VIEW UNTIL I WS ALREADY ON THE RAMP. I FEEL THAT THESE FACTORS ALONG WITH THE MISCOM BTWN THE TWR AND I WERE THE LEADING CAUSES IN THIS MISHAP.