Yeah, unfortunately that's what it sounds like. Not that it would make you feel any better now that it's done- There is a 9 volt battery connector that is used to plug into the cig lighter before disconnecting fuses/battery so that does not happen (keeps code)
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It sounds like you have a ground problem an voltage is back feeding through the circuit or resistance some where in the circuit. Do have DVOM - digital volt ohm meter ? You can get free wiring diagrams at www.bbbind.com/ ! suggest you go to youtube an check out some videos on basic automotive electrical trouble shooting an voltage drop testing before you try testing an repairing this problem . You didn't say make ,model an year of vehicle , but on semi new vehicles till now they use electronic control modules for control of these type circuits . If you are not familiar with automotive electrical circuits I suggest you take it to an automotive electrical shop .
Have your alternator checked yet? Your alternator is what actually powers all of your devices and lights when the car is running. When it is failing it will cause lights to dim. Checking connections, fuses and your alternator should lead you to a good start! Good luck!
When one side of headlights go out dim or high, it can send the extra power to the working headlight burning it out too. This usually happens if the headlight bulbs are both old. Try changing out both headlight bulbs first, as this is the easiest and cheapest fix.
Well...lets start with the obvious. Check fuses and NEVER piggyback any stereo or security stuff into their fuses...you dont want the lights to shut down during a night drive!! Check under the hood for a relay center...also has some fuses there as well.
The Daytime Running Lamps are a "straight through wiring configuration". Doubt it even goes through a headlight switch at all. But the regular lights do. Unless you've worked on the front of the car and forgot to plug the headlights back in, do this... Turn the light switch on...looking at the instrument cluster , can you make the high-beam-indicator light come on? As you rotate the headlight switch knob...does the instrument panel lights brighten or dim? You probably have a faulty headlight switch...auto stores have them...they simply plug in.