Sorry guys, I made this topic 4-1/2 years ago. Back then, all the links worked, but I’m sure the forum settings have changed a good bit since then. Side note: I was planning on coming back to GMC with the 2019’s but I just can’t get past that front end. So I bought another F-150 Platinum instead. Hopefully, I’ll like the 2024 GMC’s! Ha
http://www.gm-trucks.com/forums/topic/154520-2014-aftermarket-audio-amps-speakers-subs-installed/ http://www.gm-trucks.com/forums/topic/153662-adding-aftermarket-subamp/ Additional amp wiring topics can also be found in the Audio sub-forum
Trans are now programmed for max MPG and not driving performance, so what you're experiencing is normal. It tries to up shift every chance it gets, so if your on / off / then on gas in rapid succession, or light on gas, the trans will feel like it's lost. This isn't only a GM thing.. most manufactures are doing similar. Only remedy is an aftermarket trans tune.
Sounds like they hooked up the HIDs with a Relay Wiring Harness but did not use Capacitors. Let them know in order for HIDs to work correctly in a new Sierra you need both installed. If you look in post #1 there are wiring diagrams.. print out and show them. Capacitors have several alternate names such as error code eliminators, CAN-Bus, etc...but they're all the same thing.
Amazon backs the purchase/return, so I'd say go for it. LED bulb designs are constantly being improved upon, increasing in capability and value for dollar. VLEDs were the best available 6 months ago but by now there could easily be better stuff available.
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