UPDATED/EDITED 5-16 10:21:

I'm nearing the finish line in an installation that includes a new HU with FT/RT, FR/LT RR/RT RR/LT, and a SUB output, plus an unmarked, unidentified in the manual, RCA output on the back of the HU next to the SUB output. Here are the details:

2001 GMC Jimmy 4x4

HU: Sony MEX-N5300BT
AMP: Planet Audio 5 channel AC1800.5
Door speakers: Alpine SPE- 6000
Dash Speakers: Infinity KAPPA20
Subwoofer: Alpine SWT-12S4

I have a 5 channel amp that has Channels 1(white), 2(red), 3(white) and 4(red) marked clearly on the amp, plus a SUB RT(white) and SUB LFT(red) input, all input by RCA.
The same amp has 4 sets of output terminals, 1 each for + & -. It also has 2 terminals for the sub (+ & -), which connects to the sub on R &L posts.

I also have the White, Grey, Green, Violet (+&-'s) wires that would have been coming from the wiring harness in the HU connected to the output wires from the AMP, instead of wiring them directly to each speaker. I have 6 speaker placements and 4 wires plus having to rewire things under the carpet and through the doors to the speakers would have been a huge task instead of just hooking the outputs from the amp to the WGGV wires via speedwire. The reason for this was that I have six speakers placements: 2 6.5" in the front doors, 2 6.5" in the rear doors. In the dash, I removed the tweeters that were in a plate and replaced them with Infinity Kappa20's midrange speakers that have bandpass crossovers that handle 550hz-7Mhz hooked up. I just noticed they are 2.5 ohm, and everything else is 4 ohm, which is kind of worrisome, however the right side speakers all are sounding fine.


I've routed every plug in every location and checked each speaker, one by one by changing the fader/balance in different combinations to determine what's going on.

What I sense I'm doing wrong is that I'm wiring RCA cables with both RT/LT wires into the AMP to the HU when both only want a single signal cable each going into each jack. One single wire each that somehow is carrying both the Positive and Negative in it, versus a double speaker wire that goes into a positive/negative RCA male connector.


Is there a wiring genius out there that can understand what's going on and tell what I have wrong? There's also a whine coming from the front right dash speaker and possibly the right(passenger side) door speakers. I have the power cable far from the speaker wires on either side of the vehicle. But I'm sure it has with the larger wiring issue at hand.(EDIT: I regrounded the negative wire better and that seems to have eliminated the whine. Poor grounding.)

So now I'm not getting any sound from the front driver's dash speaker nor the driver's rear door speaker, when I isolate the signal using the HU's fader/balance controls. The rest sounds OK so far. I haven't begun tampering with gains and all that. I get sound from the front driver's speaker if things are sent to the left rear. If the signal is sent to the front driver's side I get nothing.

Any and all help is greatly appreciated. This is a crazy puzzle. Here's a diagram I made to make it more visual:

A diagram I made of the insanity

 

Sounds similar to my system. Hookup to your amp from the head unit should be 6 RCA cables. 2 are for subwoofer. 4 are for the door speakers. If you want to run two spears off the front channels, IMHO you will need to use real crossovers. I think your mistake is probably in using the factory wiring. Did you know the factory wiring for the front tweeters have a funky resistor in them?

I have four Focal RSE 165s in the doors with four crossovers and component tweeters in dash and up high, a Kenwood head unit, and a 5-channel Soundstream amp. Yes, wiring it all up is a major pain. I put the amp in the rear compartment where the old analog satellite receiver was located.

post 18
https://blazerforum.com/forum/audio-video-electronics-8/best-speakers-budget-79590/page2/

Really don't understand your white/grey/green/purple speaker wiring. There should be two separate wires for each of the 4 channels. Maybe the attachments will help.