it could be a fuse there are 2 fuse blocks in a Bonneville under the hood and under the back seat.
If the alternator is not the issue, it could be a problem with the voltage regulator, wiring, or a faulty battery. Have these components checked by a professional mechanic to determine the cause of the pulsing headlight and interior lights.
bad headlight switch
possibly
Dead cell in the battery or the ignition or lights were left on.
water in the wiring or a low battery
A short in the wiring.
bad headlight switch.
A loose battery cable can cause your vehicle to on most stall and it can cause the lights to Flickr. Make sure your battery cables are tight and free of corrosion.
If you have no battery then you have no power.
No. A bad battery is not causing your dash lights to go on and off. A different part is bad. Without equipment I have no idea what it is.
it's your headlight switch
If the parking/tailight fuse is good - then it may be a bad headlight switch No tail lights but the bulbs are working? Please explain.