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Neighbor gal has 99 ex, just replaced battery, before i replaced it, her headlights are not working, checked fuse n bulbs and they're fine. bottom of car is rusted pretty bad, replaced part of fuel lines recently.,. Any help you can give me would be greatly appreciated.. where to look for short, or is it possibly the switch ? thanks ahead of time..One more thing, while running should i see in the mid 14's at the battery for alt to be good, only showing like 12.4 on multimeter .. thanks

 
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remove, clean and inspect grounds

 
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Can you possibly tell me what volts dc i should be reading at the battery while car is running ? I'm only getting like 12.4 vdc , shouldnt it be in the mid 14's ?

 
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14's unless it is not charging the battery
Honda alternator turns off if no charging needed
that prolly one of the reasons aftermarket alternators does not work with Hondas.

 
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A fully charged battery is just a hair over 12V if I recall correctly, so it sounds like you don’t have a functional alternator.

OEM only. Junkyard is better than a cheaper new aftermarket.

 
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ah, rodents love to chew honda wiring, BTW...

 
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Check for power and ground at the bulb sockets, work your way back

 
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What Colin42 just said in post 9,328. It is like climbing a steep mountain. Take sure steps to get to the answer, logically. One step at a time.
Anything else will probably just waste your money and time.

I would add that it is probably not a short if you have not blown the fuse... and you said that the fuse isn't blown.

I am currently dealing with what appears to be an open in my harness. I wasted a lot of time and money replacing parts before I started taking more certain troubleshooting steps.
Mine could be a cut wire (that is not shorted) or it could be a bad connection.