Battery draw and buzzing coming from behind glove box

[Viperlover]

I believe this has something to do with the heater fan because it started after I hooked it back up. This is in my 71 Monte Carlo.

So the battery is completely flat. When I tried charging it tonight I heard a buzzing coming from the car. I could also feel a faint vibration on the passenger side of the firewall.

After investigating a bit I found that the buzzing is coming from some box with wires coming from the bottom that is right behind the glove box. The buzzing got louder as I opened the door and activated the interior light, but it had a bit of delay to it. When I pushed the button in to turn the light off it took a second to quiet down, but still buzzes.

Has anyone ran into this before with a Chevelle or any other old GM vehicle?

I would like to get this figured out soon so I can take this freshly T56 swapped Monte out and rip some ass.

[Viperlover]

I disconnected the ground for the heater fan switch, it still buzzes.

I pulled out the two metal pieces in the steering column by the key, it still buzzes.

This is beyond aggravating.

[OBeer-WAN-Kenobi]

Heater resistor?
Blower relay?

[Che70velle]

This is without the key in the ignition switch?

[GregWeld]

You may have a dead short IN the battery --- but because it's flat there's just some voltage without any amperage. I would disconnect the battery and take it and run a load test etc on it. Sometimes a battery can sulfate and the sulfate builds up in the bottom of the battery until it shorts out the plates.

[Viperlover]

Didn't matter if the key was in or out. I believe it may be the blower relay gone bad. I pulled the plug out to stop the buzzing and my fan still works with a switch that was wired in years ago.

It no longer kills the battery and everything works...

Finally got to take the Monte out with the 6 speed. Great easy clutch pedal and the pro 5.0 shifter is sweet. No more burning up the old TH350.