Headlight Relay Clicking???

Hello, I am new here, looking for help on a topic I've searched high and low for... Earlier today I was tightening my battery terminals and once I was done, all ready to leave I try to crank the truck and I get nothing, all the dash lights, radio.. everything works but the truck will not even begin to turn the starter. When I turn the headlights on I hear a buzzing or fast clicking noise coming from the headlight relay. Any help would be greatly appreciated. This is a 1998 tacoma 5sp 4x4 v6 engine.

 

I've checked the battery, checked the headlight relay, all the fuses, took the fuse box off to inspect it for frayed wires or bad contacts all checked out good the only thing I can think of would be a frayed wire somewhere else.. shoot some ideas and opinions my way

 

Dead battery, or very close to dead battery. Less than 12.4vdc and it's dead or close to it.

 

did you check the voltage on the battery? what exactly did you do to the terminals?

 

Its a dead battery. something like this happened to me the other month. YOu have not voltage in the battery. For me, the battery was fully charged but only had 2.1v lol my stereo sucked it dry.

take out the battery and take it to a car parts store. they should test it for free and you can find out for sure