Remove the alternator and have it tested at any auto parts store?
There is a voltage regulator located on the internals of you alternator replace the altenator. Voltage regulator keeps voltage constant and stops spikes in power output, this is what is causing your headlights to blow.
i bet it wouldn't be hard to put the headlights on the radeo power that comes on when the ignition is on...
Symptoms indicate the timing chain broke or came loose.
Headlights - Cat Power song - was created in 1993.
When a cars headlights, AC, and radio are losing power, it is possible the alternator.
Bad switch? Headlight Relay Fuse/Breaker needs replacement
If it is an aftermarket stereo then i would say that the installer tied into the dashboard illumination or headlight power wire for 12 volt power for the stereo.
The headlamp switch controls the power to the dimmer switch and then on to the headlights.The headlamp switch controls the power to the dimmer switch and then on to the headlights.
That is usually a regulator problem. Most regulators are integral to the alternator, but there are always a few that aren't, just to frustrate owners who want to work on their own vehicles.
The starter in your E350 could be going bad. If the sensor or wiring is faulty, you will not get enough power.
check the fudes check headlights for power then check light switch
read your owners manual. or maybe it's because the headlights take alot of power.