It could mean your battery is about to go. Mine acted the same way then about 2 weeks later, the battery finally died.
Also make sure all your connections to the battery are good and tight.
-Ken V.
1998.5 SE Praire Tan Zetec ATX
psycho_bass@hotmail.com
Roush springs Roush rear sway bar BAT struts 17" Millie Miglia HT3 and a ton of subtle asthetic mods
