likestrucks1

I have a 2014 GMC Sierra Denali, 6.6L diesel, and added LEDs to the headlights, taillights, cab roof lamps, installed a LED tailgate light bar, and replaced all of the interior bulbs with LEDs. There is no flasher unit on 2014s and up, even though you can hear a clicking noise that seems to be coming from the main fuse box in the engine bay. The clicking noise, at times, can also seem to be coming through the speaker system, specifically through the speaker on the driver door. I have no idea what causes the clicking sound, but I can guarantee you there is no relay. If you want to install LEDS, you will have to install load resistors on every wire, meaning a resistor on the load or power wire, and one on the ground wire... 2 resistors per LED bulb. For example.. you have a rear tail light with two LEDs, one white for backup, and one red for braking and turn signal. You need four (4) resistors. One for each of the two wires on the red LED (2) and one for each of the two wires on the backup LED (2). The LEDs will get very hot, so be sure to shied anything near them from the heat. Make sure they are not in contact with anything else when possible, and secure the resistors to something metal using the mounting hole on the resistor body. The ones you can buy should have a hole so that you can mount the resistor to something structural. I included a link to the resistors most people are using and the ones I used, and a picture is uploaded. Hears a warning. The resistors come with the handy splice clamps. after I installed all of the light and resistors, which took half a day, I still had hyper-flash, which made me very frustrated. I went around and checked all the splice clamps and found one that was a little loose. If possible, hard-wire in the resistors. The message is that one stinking bad connection out of 24 splices will still leave you with hyper-flash, so you have to be absolutely sure you have solid connections. For heat shielding, I covered my cardboard templates with high quality foil... and two or three layers or wraps of the foil. Load resistor link.