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in low beams or high or both? that is caused by: 1: bad held lamp. old lamps can go dim. swap left and right, if dim follows bulb, bingo weak bulb or wrong type bulb. buy matching blubs (same brand and P/n) 2: bad wiring to lamp. damaged wires, or connectors to same. 4: bad combo switch. (if low beams) 5: bad fuse or holder, corrosion , to either. head lamp fuses. there are 2. left and right. 6: hackers, many hackers put in wrong lights. inspect it.
I dont see if the turn signal light has to do any thing with the engine shutting off, make sure the IAC idle air control valve is working, air filter is good, fuel filter is good and IF your vehicle has a power steering pressure switch then that could be causing it but with 1985 Crown Vic I dout it.
Check all the bulbs at tail end for parking and brakes, test grounds and harness for trailer. Check fuses. clean batery terminals, Re instal head light swich properly and make sure all wires conect.
They are changed from within the engine compartment... at the rear of the headlight bazels... if it's the side on the battery you may have to remove it.... also don't touch the bulbs with your fingers as that shortens the life of them.
I noticed this is 6 months old so I don't know if you have figured it out yet but heres an answer for you. On the back of the headlights there are 3 plastic heads, they turn but spray some wd40 or something on them first. You might have to take the headlights assembly out to get a good bite on them.
If only the headlights are dull and not putting out the correct light, I would suspect a bad ground (earth) connection somewhere in the headlight circuit or the fuse for the headlight circuit. Something is causing excessive resistance and causing less voltage to be provided for the headlights. If all the lights are dimly lit, then I would check the charging system, the battery and the ground cable for the battery, chassis, and engine.