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It'll swing 500 depending on drive- and meter used to measure lol...and when you key with no modulation, check to see if its dimming severely or just with audio. Also, this amp should only be pulling 35-45A peak....No way it should be killing the TB system unless there is another issue, like a...

07 trailblazer

(4) 1446 Transistors IIRC ....Should NOT be pulling your truck that hard. And it is a wonderful amp for your intended use! 1446 is rated 70W.

8113 - have you tried giving the Chevy a few more RPM while keying? Many alternators make a fraction of rated output at idle.

My point exactly, get a better antenna, tune it and you can do more with less...adding an amplifier to your setup with out the basics being sorted is just complicating things.

8113 - Your truck I think has a 130A minimum alternator....you shouldn't be dimming as badly as you describe unless that amp is bigger than 4 2879 finals. I wonder if RF is causing issues with the vehicle's electronics. PS - if it is bigger than I mentioned, definitely ditch the Firestick...

I'm not sure about the 4ft FStick, but I know the wilsons are very sensitive for receive and can tune to sub 1.5 on a TBlazer. I have a GMC Envoy (same) and have run my 5k on it (b4 stolen). So i was thinking if you have an antenna tuned well, you will hear better and make better use of your power.

8113 - Run a wilson 5000 mag mount, and turn that amp way down if its variable. Maybe you can give it less drive until you add the second battery. It certainly wouldn't hurt, but the wilson I would make happen for sure.