Elictrical system flashes on/off, then dies.

intermittents are sometimes hard to diagnose out !! and this seems as one , im curious though what made them wiggle the relays and fuses ?? was there a previous problem there ?? depending on year of manufacture of car , is weather or not the cars own pcu can help diagnose what made car stop , as later models "remember " what there last condition was that shut off engine , of course this requires diagnostic equipment to see this info that typically car owners don't own , but a qualified service tech does and knows how to use it to find your problem

A "light" never comes on to tell you your battery is dying. If you have the original GNB battery from DaimlerChrysler, you\'re WAY past due for replacement. 2008 Avengers, especially the 2.4L PZEV engined models are NOTORIOUS for being hard on batteries, especially if all you do is putt around town, due to both the onboard alarm system and the positive EGR pump, which runs right after you shut the car off every time, putting about a 30 amp load on your bettery without the alternator charging. Frequency battery maintenance and equalization charging is essential in the case. Also, Chrysler started using those horrid stainless steel "post straps" back in the \'90s, and those damned things will cause oxidation of the lead on the posts, due to dissimilar metals. Either way, service your battery, or replace. You\'re obviously from the south somewhere; it\'s SIT, not "set".

new batt if it is over 3 yrs old-needs to always be at 12.6 v--its not holding charge well--have it load tested--probly only gettn a surface charge onit-it will fool u

I would want to know if you have at least 12 volts at the battery posts, and also at the starter. You need to know if the cables are causing the problem, or something else.
Once the engine starts, it should be running off the alternator, but it still needs the battery in the circuit.

First lets make sure it not the alarm issue.Roll down a window. key off engine off,remove battery cable,touch the two cable for 1 minute,reinstall cables. put the key in the ignition but dont crank it. Turn it to the ACC position and leave for one minute,start the vehicle.

sounds like it could have ignition module failing,also possibly coil starting to go.I seen same problem on 92 hatchback,put module and coil on and runs fine.goodluck...

Welcome to the world of BMW's. return the car to the seller. you got a bad one. You got an electrical short draining the battery. Bring a blank check and sign it over to the dealer. They're going to have to run through the entire electrical system to find the short. That work alone is worth more than the a used up 2001 325i.

even if it looks okay its not okay. do a tune up on plugs, wires, if needed oil change, air filter FUEL FILTER VERY ditributor rotor, cap. important

i had the same problem and it died out of town got it towed and it was the fuel pump fuse and that was it they are famose for it

try checking the secondary ground wire that comes off the battery see if its loose or corroded might help