Periodic battery light flickers on my 2003 town car.if you just tap on brake or flicker headlights .is there a separate diode that could cause this?

Sometimes, a headlight may start flickering due to physical damage to headlight components. The inside of the connector may start to melt, causing a poor connection. the bulbs or lamps of your headlights are old or damaged, it can cause the headlights to flicker. Fortunately, this can be a relatively quick fix.

When the alternator starts to give out, your car’s electrical output is affected. This could result in flickering, dimming, or inoperative headlights, as the headlights depend on power from the vehicle's battery. When the alternator is unable to charge the battery, the vehicle's electrical system will quickly drain the battery. One of the most common causes of headlight flickering is a dying battery. Your headlights rely on power from the battery to function properly. If the battery is failing, flickering, or dimming headlights may be the result. In this situation.

Well , find the short . videos on youtube showing how to . How to find short to ground blown fuse Finding active short

check out videos on basic electrical testing as well , have charging system tested as well , bad diode can cause flickering lights .

Theres a power/ground problem somewhere in harness or instrument panel..send issue to [email protected]

Normally when headlight flash its and overcharge problem max volt from the alt is 14.5 video is if you got to change your alternato

Bad ground from lights to body

Get a volt meter, start your car and see how many volts your car is producing while running. Should be around 14 volts. May want to watch the meter for a while since your electric seems to fluctuate. Most voltage regulators are internal of your alternator. If you are getting a lot more or less than 14 volts while running, replace the alternator. If it is not charging, voltage will drop as vehicle runs, until battery is dead.

The following lights all came on at the same time:
Brake light, ABS, BAS, ESP, and TCS, What does this mean.

Sounds light your headlight switch is bad. These will effect all back lights. Check headlights for any flickering while wiggling head light switch.
Good luck and thanks for your question and I hope my suggestions help. burdfrenzy
Visit My eBay Store! http://stores.ebay.com/Pittsburgh-Joes-Pants-Nat

check the ground wires under the battery tray
you will need to take out the battery and hold down tray.

have the output of the alternator check... and perhaps the battery posts may need cleaning as well.

Robert