If your ground is good and your + is connected directly to the battery, it may be time for an RFI filter. I've had good luck using ferrite beads.
Does the noise also come through the "infotainment " system?
If you don't have solid state ignition, you might try changing the condenser. If...
We ended up ordering a computer and some software and repairing ours ourselves. It took about 7 months from failure to repaired. We've since sold ours. FYI, there is a place in Gulf Breeze.....Gulf Breeze Automotive if memory serves me well that works on them.
I live as bout half way between Mobile and Pensacola. I've been unable to find anyone interested in working on a Sprinter other than the Mercedes dealership in Pensacola. Most places we contacted didn't want to deal with deisel and th ed deisel shops didn't want to deal with a Mercedes. Good...
If I were you, I'd look for a speaker that I could mount in either the "A" pillar trim or perhaps in the overhead console. Locating the speaker so it can be aimed at the user allows for lower volume settings.
I know that wasn't the plan. Just my thoughts.
Carry a spare relay. My experience has been that using a high current (30a) relay to switch low current (<1a) load results in intermittent connections inside of the relay.
Sorry, I was unclear on my post. I understand your goal but see no advantage to switching with the high beam over switching with master switch. It seems to me that switching with the high beam adds a few potential failure points. However, it is your vehicle, your call. I wish you only success.
You seem to be on the right path. Tie the two battery positives together and the two negatives together. That keeps them at 12V and adds up to 400ah you're aiming for. Tie the + to a buss bar and the - to a separate buss bar. Connect the solar controller "charge " wire + to your + bussbar...
Check out this thread.
https://expeditionportal.com/forum/threads/video-review-of-10-american-made-campers-priced-under-10-000-2020-2021-review.235188/
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