My Bonneville has always done this. Because it always seems fine while driving, I never thought it was a problem. Mine is under warranty still so I'm going to have a few problems fixed and I will mention this problem also. I'll let you know what they say.

Tracy...have you checked the battery connections? Voltage fluctutaions etc could be the cause as mentioned.

We've seen all kinds of craziness due to loose battery terminals, corrosion is another thing to consider.

There is an override on our shifters that turns the lights on automatically if the system is overridden (twilgiht sentinel 96-99 TMK).

Not yet...mine'* under the backseat, however i suppose there could still be some corrosion...I need to buy a new battery before winter anyhow... will have to check it out.

00+'* do not have any override like that, Bill. DRL'* come on when shifter is not in P on 96-99, and 00. Not sure if Tracy'* particular problem is related to that. Something is cycling the lo beam relay in certain instances, it seems only while at idle in P.

Agreed Mark.. the mentioning was to put it out as a possibiltiy.

Tracy.. sounds like it'* time to do some work on the car... let us know what you come up with.

The HDLP LO BM relay is indeed in the front engine bay fuse box. Turns out that little sucker has three bolts holding down and additional cover... needless to say, I didn't open it (can't find dang tools - kids have them scattered).

Checked the passenger front floor for any signs of dampness - none. Couldn't figure out how to get to the DIM... couldn't find any reference to it in the owners manual... that book is about useless for the real "nuts and bolts" of a car. I guess that'* what the FSM'* are for. (where is that disc from WCBF anyhow? Hmmmm).

I did manage to pop off the backseat and inspect the battery somewhat. Clean and dry under there (except for some pen caps and pennies). The battery terminal bolts that are exposed did show signs of corrosion. Again, no tools to take of the cables. Felt really useless about that time.

So... I'm thinking that I need to get a new battery before the Oct 6th meet in Rochester (NYBF) and will con some willing menfolk to change it for me and check into it further.

Note: blinking occurs only in Park while Idling. No blinking in Drive, Reverse, or Neutral.

Tracy, do not remove or loosen those three bolts in the underhood fuse block. The additional cover that is in place will slip over the bolt heads. Pull it straight up to remove. I know you know this, but when you get your new battery, clean the main lugs on the battery cables with baking soda. Check for any corrosion underneath sleeving at the lug terminals. If neccessary, replace cables, lugs as needed that are beyond cleaning or repair.

UPDATE: Seems to be fixed....
Toasty taught me how to properly install a new battery this past weekend (and he laughed when I got sparked connecting the negative to the new battery... ) Since then, I haven't had an issue with the intermittent blinking headlights while ideling in Park.

Time will tell... but I think that did it. No corrosion, btw, on the cables and so forth. Bit the bullet and got an AC Delco battery... this last one lasted me 6.5 years... can't complain about that!

And I'm moving my own thread to Electrical ...

Hey Sparky.........................err Tracy, Congratz on the apparent fix. I guess it was a weak battery. Glad you got it resolved.

Toasty wasn't happy when I made him take out the bolt, remove the rubber boot to expose the perfectly clean and great looking cable end

I wish I had seen you get "Sparked", I must have been in the garage dealing with my coolant leak...