I have a 1999 Dodge Caravan Le. The headlights and courtesy lights don't come on anytime(unless you jump power over the relay), the park lights stay on all the time and wont shut off unless you take out the relay. I've checked all the fuses and relays in both the power distribution box (pdb) and the Juntion box(jb) and they are all working properly. I've tested both the dimmer and headlight switches with a ohm-meter and according t\o the repair manual I have they fall within the specs. I can jump power to the headlight relays and that will turn them on. There is no power getting either to the fuses in the (pdb) for eitherthe headlight switch. The bright lights on the dimmer switch work but don't stay on. There is power to the low lights on the dimmer switch. Help!!!!
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I see that you mentioned a 1999 Dodge Grand Caravan in your other question. I assume this question is about the same vehicle.
The checkup will start from the fuse and relay in the power distribution center. A way to test the relays is swapping two relays of the same kind to check if that makes any difference. If relay and fuse are OK check the wiring to power distribution center, check the dimmer switch and the connection to BCM (the module under the dash).
Sounds like the relay is burning out. When the lights stop flashing does the indicator on the dash light up and stay on and/or does the exterior lights light up and stay on? If the indicator light is staying on then you have a wiring problem to the lights or you have the wrong bulb/ bulbs. If the exterior lights stay on it is a bad relay or power to the relay.
I am not much of a mechanic any more ,but I do have some experince with electronics and for any circuit to operate battery has to flow to ground.Direct battery to ground will blow a fuse or melt your wiring if the fuse does not blow.If your parking lights stay on all the time then there is a complete path from battery to grd through the lights,and it sounds as though what ever is causing the problem on the parking lights is killing the path to your lamps relay.A wiring diagram may be available on the internt or library.Good luck.
check the ground cable at the battery , youll see a break in the ground wire at the battery box, check to make sure the bolt is tight and not corroded (the break is the ground for most of the lighting )
Relays are located in either the Power distribution box (by the battery) or the junction box under the dash. If that is not your solution I would try the Body Control Box which is under the fuse box under the dash. I just went through a similar problem, check out 1999 dodge caravan with headlights out and park lights on all the time. I replaced this body control box($350 at the dealer) and it took care of my problem. everything works now. Buy it from a wrecking yard it's a lot cheaper. however you will probably have to pull it out yourself.