since you have both amps and an EQ in the system, you are obviously kinda serious with the system, so there are some things you might want to do differently:

1) when wiring up the headunit (HU) some professionals will suggest you use only the OEM ingition wire, and run the rest yourself. this is, of course, up to you, but in the long run may help prevent ground loop interference. so, run a FUSED hot from the battery, a ground straight to the chassis, and the RCA to your EQ input.

2) for the EQ (which im assuming is in the dash below the HU) wire its power straight off the battery also, but with another FUSE. and ground it in the same place or very close to the HU ground.

it sounds like you wired up something through the OEM radio wire, and your setup is drawing too many amps through that RADIO/CIG fuse. either that, or you have a short somewhere (which is very dangerous, DO NOT put a bigger than OEM fuse, and DO NOT jump the wire.) most aftermarket HU's have a 10 amp fuse on the back, and most EQ's will come with an inline 7.5 or 10 amp fuse. DO NOT ever exceed those ratings, or you run the risk of electrical fire.

if you can, draw up a schematic of how you installed the HU and EQ, and i will try and find your prob.