GMC Repair: Dome Light & Wipers, door switches, pulse module

Question
1998 Yukon - VIN 1GKEK13R2WJ734470

1. Dome "mysteriously" comes on - kills battery
  Do not see a problem with door switches
  Have replaced the headlight switch - no success

2. Wipers "hestitate" - when turn on/off numerous time they come on again.  No pattern - totally random.  

Answer
I think I can help you, my 1998 Tahoe did the same stuff.

If you have the double door in the rear the dome light is probably from a bad pin switch on the right cargo door.

The wipers are probably a result of your pulse module going bad, it is the black cover on the motor.