I don't have my FSM to check, (my folks are visiting for the holidays and snoring up a storm in the room the manual is in, LOL) but I believe there's a test connector in that area. Not supposed to have anything connected to it.

1990 Monty LS 3.0 A/T LWB. KYB front shocks, OME rears and coils. 33x10.5 BFG Muds. 5.29, 2.85, RD110, RD46. 2 bouncys. Aisins. Monte Disco swaybar disconnects. GenII t-arms, idler arm, UCA's, V45W front brakes. 2in BL.