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Pretty sure there is no relay for the headlights. There are two 10 amp fuses in the fuse block, one for each side headlight. The power to the fuses is directly off the black fusible link (in your fuse link box, under hood, by the battery). Then the fused wires go into the headlight switch, and with switch on, out to the head lamps.
First check if the fuses have power to them. Hot at all times, so key can be off. If they have power, fuse link is good, so possibly a bad headlight switch or dimmer switch if no headlights..
Sounds like a ground wire problem. Does it act up in the rain or after a wash? That could indicate the fuse block under the hood my be geting moisture. But definitely check the main ground, fuse Block ground, and headlights ground. Check headlights plugs n turn signal plugs n sockets. Also, start by changing the bulbs. Both of them. There's two filaments in each bulb, one for marker lights and one for blinking
Could be Headlight relay, bad ground, bulbs blown, fuse blown or unplugged connector under the hood. The interior headlight switch is a long shot. Make sure everything under the hood is hooked up. Look around the firewall or headlights for unplugged connectors.
what fuses were blown and replaced? Theres a TBC fuse under the hood, along with a Headlamp Relay. Theres a R HDLP and LT HDLP fuses, make sure they are getting power, and are good. If the LT HDLP and RT HDLP fuses are good AND getting power, then the TBC fuse and the relay is good. then I would suspect the Hi-Lo dimmer switch bad. The LOW beam ground wire is YELLOW, the high beam ground is PURPLE. see if high beams work, if they do, then I suspect the dimmer switch is bad.
Most cars have a Headlight relay and within the relay different terminals will split the power to parking lights, headlights, etc. It is possible that part of the relay burned out while the balance still works. You may have a fusible link (wire) to the relay box for just the headlights. A good Autoparts place should show the requirements.
I suspect the bad connection on the battery caused the Starter to draw power or a ground through the easiest path of least resistance. This shorted the grounded Relay.
Physically remove and check each of the fuses, use of a multimeter can sometimes be misleading. There is one fuse for each headlight and one for several of the relays -- either one might cause the issue.