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  1. H

    2017 Yukon - Blinking headlights, but alternator and 2 batteries working fine

    I guess my problem has been solved, after installing two new batteries at the same time, instead of adding a second battery to the original, it had fixed the dimming lights. I wanted all the other stuff anyway, the 400 amp alternator and 2 batteries, just to max out the vehicle for a sound...
  2. H

    2017 Yukon - Blinking headlights, but alternator and 2 batteries working fine

    The best battery I can find online seems to be Diehard Platinum AGM, then next step up is the Optima batteries
  3. H

    2017 Yukon - Blinking headlights, but alternator and 2 batteries working fine

    I'm going to try getting two new batteries first. I recently added a second battery, but keep the Everlast battery that came with the yukon, car unstaller said it was working fine, and headlights didn't start to blink until 3 weeks after install. So two identical batteries with the new...
  4. H

    2017 Yukon - Blinking headlights, but alternator and 2 batteries working fine

    Well... I had the Mechman 400 amp alternator installed and during the daytime I saw a difference, radio up, and ac on full and volt meter didn't budge. But at night, after a cold start after I've been home for 8 hours, headlights still blinking and even dimming when I press the windows buttons...
  5. H

    2017 Yukon - Blinking headlights, but alternator and 2 batteries working fine

    I thought this was all linked to the stereo addition, but my headlights dim when I just press the power window buttons. Everything is happening after i slept the night and Yukon been idle for 12+ hours. Just a weird problem, when the volt readout is 14.8 and I see the headlights dim
  6. H

    2017 Yukon - Blinking headlights, but alternator and 2 batteries working fine

  7. H

    2017 Yukon - Blinking headlights, but alternator and 2 batteries working fine

  8. H

    2017 Yukon - Blinking headlights, but alternator and 2 batteries working fine

    Thanks for so much details. I will add some pics of the batteries and the fuse thingy the installer added on the installation to the main battery, asap. He hasn't added any capacitors yet. Looks like 2-3 weeks in the new alternator, headlights replaced next Friday, but I will keep giving...
  9. H

    2017 Yukon - Blinking headlights, but alternator and 2 batteries working fine

    I ended up ordering a mechman 370 amp, it caught my eye that it was recently redesigned in 2020. It keeps the alternator at 200 amps when idling. Replacing the headlights with led might help a little, but I want a lot of help so I can run the ac, wipers, with the radio. And I would like to...
  10. H

    2017 Yukon - Blinking headlights, but alternator and 2 batteries working fine

    The car installer used #0 gauge wiring for everything. I was there today and when we turned in the headlights and fog lights and went to 100% volume, the headlights and fog lights wouldn’t blink at all, made me look like a lunatic. I did just drive 20 miles to the shop. All my blinking is from...
  11. H

    2017 Yukon - Blinking headlights, but alternator and 2 batteries working fine

    Thanks for all the detailed info, I will check on the cable gauge with the installer.
  12. H

    2017 Yukon - Blinking headlights, but alternator and 2 batteries working fine

    Greetings, I’ve done a complete audio system change, all speakers are RF power series and added, (2) 400 watt amps and (1) 750 watt amp. I added a second battery to the available spot under the hood. And replaced the head unit with a Sony, and added 26 speakers if you count the tweeters inside...

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