1998 Dodge Grand Caravan Headlamps Problem: They Operate On/Off on their own

I have a 1998 Dodge Grand Caravan. Over a week ago, the headlamps started going on and off intermittently on their own with the relays in the fuse box under the hood next to the battery clicking on and off (in time with the headlamps), stop for a minute or two, and then start going on and off again, etc. The problem seemed to go away for a few days and then the problem started occurring again. The problem now seems to have gotten worse. I think I have finally narrowed the problem down to the low beam relay. I noticed today that with it in, it clicks rapidly along with the high beam relay and parking lamp relay (but they don't click as rapidly as the low beam relay). If I take the low beam relay out, the others continue to click as before. I've been told I may have a grounding problem, but I'm not so sure. The daytime running lamp module (part # 4686094) is now making a loud clicking noise, but I'm not sure if this is contributing to the head lamp relay problem and I haven't dug enough into the shop manual I borrowed to determine if that module has any effect on the head lamp relays. If I take the daytime running lamp module out though, the low and high relay lamps still continue to click away. I'm not sure if it also affects the low and high beam head lamps somehow in a normally-open or normally-closed condition when the module is operating normally. I replaced the headlamp switch so that's been ruled out as a problem. Any ideas? Thanks for any help.

I now understand the problem could be due to a defective Body Control Module (BCM) and/or a grounding problem associated with it (http://autorepair.about.com/library/faqs/bl760h.htm). According to a local Dodge dealer parts department, the headlamps control circuit is connected to the BCM.

First thing you need to do is make sure the battery is fully charged and will maintain that charge under load. Get it load tested. Make sure the battery post connections are squeaky clean and tight. Make sure the battery to engine and engine to chassy ground coinnections are not corroded and tight. Even if they look "good" it wouldn't hurt to clean them and retighten. The computers/modules are sensative to low voltage and voltage spikes caused by loose or corroded connections. Chattering relays is a sign of all of this.

I've scanned over a sadly lacking Haynes schematic. The BCM appears to control the ground to the low beam relay coil. The high beam realy coil ground is a separate ground at the instrument panel ground block which, I believe is at the left kickpanel. The BCM could very well be the culprit but, can't say much more without a good schematic. Suggest you check Alldata.com or Mitchels for that.