Awesome! I actually put mine in yesterday 02/20/2021 and everything works great thanks to you!
I will add a little of my personal insight to what I did and hopefully it helps as well.
I'll start by adding your diagram with the added bluetooth adapter.
I used the Millennia MIL-BTREC and bought it from Crutchfield.
But I also see your JL MBT-RX there as well, both will work just fine.
**Please note** Most of these 12v add on bluetooth receivers I see "
do not" have the hands-free cell phone talk options on them.
This was a bummer because I really wanted that feature as well but guess these inexpensive units do not have that feature on them yet.
If anyone is reading this in the future, please let me know if they ever use/find one that does have the additional hands-free option added.
I will probably take mine back out and put that unit in instead.
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What I did with my set up is I added a single throw 12v switch that has a light in it so I could pick up a ground there, plus it will illuminate when on.
My switch has three contacts/poles on it. 12v+ Line in-----12v+ Load/Line out-----12v- Ground
Battery - Orange goes to the Line side of the Switch making it hot all the time.
Tape-On - I wired in the 12v + of the bluetooth adapter/Dk Blue to the Load side of the switch. - This allows me to turn the bluetooth on or off when I want.
H-GRD - goes to Black/12v - side of the bluetooth adapter. If you have a switch with a ground like I did(because I have a light), it will also tie into the switch there.
On the audio side of things I used female solder-on connectors to plug my RCA's into to make it a lot cleaner look to me.
I had found that the Ground inside the Bluetooth adapter was already bonded together internally so I didn't have to solder a jumper from the female RCA ground jack to the other ground-side jack.
My truck did not come with a tape deck so I had to get creative here as well.
I found that in 95'-98' the Cd decks had the same 9 pin connector with an actual removable wiring harnesses and with this I was able to pick one of these up off of eBay really cheap ($12.99).
The Tape decks for these years are still the same 9 pin black connector.
This is a blessing because you will now own two connector plugs - Have one for spare for the next truck!
Instead of buying a whole tape deck just to rob the harness off of, the connectors are the same as the connector used in 88'-94'
I no longer have any junk yards in my area and old tape decks just to rob a harness off will now cost $50 to $200 bucks.
**Disclaimer** The colors in the wiring harness from 95'-98' are different but you will have to just transpose the colors over like I did.
Sorry these are written on the cardboard box that my bluetooth receiver came in.
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Here is the final product
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The other switches are for future items - Backup Camera and Led-Strip lights for the Bed at night.
I used a blue light for Bluetooth but do not recommend.
Blue is too piercing at night and too bright, It will shine in your face.
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But other than not having hands-free calling...**yet**!
This absolutely works phenomenally and Lance...I bow to you sir!
You are a gentleman and a scholar and their are only a few of us left.