Your best solution? Stop!
In the first picture you posted, see those two unused grey plugs behind the white, butcherd plug? Use those plugs for your new HU, abandon everything else.
Those two plugs are wired directly to DC power and all the speakers, bypassing the amplifier. The amp needs to...
Iirc, the 1N4001 diode should be capable of handling 1 Amp of forward current, which should be more than enough for two relays (at about 150 milli-amps each).
Maybe your diode failed prematurely, or maybe there's a short across one of the relay coils. I would do a quick Ohm-check across the...
Are you using a single diode to supply two relays?
If so, try running a separate diode to each relay.
(Each diode will have the banded end connected to pin 15 of the ECU connector)
I just made this simple L- bracket and mounted it here:
The old VSV is left in situ and the new one is plumbed in series with it. Disconnecting the harness was the only hard part, but once free it has just enough length to reach the new valve.
Iirc, I was able to use the existing vacuum line...
I don't exactly know the behavior of the "L" terminal on the alternator.
@george_tlc is it supposed to source current when the alt is working properly?
It obviously sinks current when the alt is failing.
Sorry, but I won't be able to help you at this time.
The answer to your question can be found in the Electrical Wiring Diagram (EWD) for your model/year. It can be downloaded from the resources section in the menu above.