Quad fuse is installed and provides power to A1, I did a test for the AC voltage regulator per TM 9-6115-643-24 ( 4-1.1 ) h, has between 4 and 12 VDC J, terminal 10 and 11 of AC voltage regulator does not indicate 210 to 280 VAC i, does read 3000 ohms. Statement m is got me confused (easy to do) " If steps H, j, and i are as indicated above AC voltage regulator is defective and must be replaced" I'M lost not a clue in how to proceed and frustrated! Also I checked ohm reading on exciter field leads and came up with 34 ohms range is between 28.6 and 38. 7 . I've got way to much money and time invested on this iron sled! That started out with the motor and turned out to be the fuel pump internally out of timing that I had bench tested for repairs. Aggravation is setting in any HELP would be greatly APPRECIATED THANKSThe quad fuse mod is to protect the A1 volt regulator. It has a fuse in it to keep the A1 from over volting.