Can someone tell me what the 4 small relays and 1 large relay under the hood next to fuse box on left fender are...Do they control the 4x4 electronic shifting...sometimes they sound like they are clicking, sometimes my 4wd engages and sometimes it will not disengage. The drive shaft turns o.k so I think the transfer case motor is o.k. any help would be big help...I have a Chiltons manual but can not find out what these relays do....