Equipment:
(2x) 1995 Subaru Impreza WRX's
(2x) Oxygen O'car HU
(2x) Alpine KTP445 amps
Alpine KTP445 is a class D amp placed between the HU and the car's factory radio wiring harness.
I cut and soldered the KTP445 in place between the deck and factory harness on both amps identically since they are the same HU and same vehicle. So now I have 2 identical amps wired up to identical wiring harnesses to identical decks in two of the same make, model, year cars.
Installed HU#1 and AMP#1 into car #1 (Black WRX wagon), sounds fantastic.
Installed HU#2 and AMP#1 into Car #2 (White STi sedan), no sound from speakers. but deck powers up
Installed HU#2 and AMP#2 into Car #1, Sounds fantastic.
Installed HU#1 and AMP#2 into Car #1 sounds fantastic.
Installed HU#2 and AMP#1 into Car #1 sounds fantastic.
Already know HU#1 and AMP#1 work great.
Installed HU#1 and AMP#1 into Car #2, NO SOUND. but deck powers up
Installed HU#1 and AMP#2 into Car #2 NO SOUND. but deck powers up
Installed HU#2 and AMP#1 into Car #2 NO SOUND. but deck powers up
Already know HU#2 and AMP#2 = NO WORKY but deck powers up
SO all combos work in Car#1 and NO combos work in car #2, I think it must be the car that is causing the problem. I look for blown fuses. Find nothing wrong, switch fuses around. No difference.
I test speakers at different location in the stream to find the source:
@ door = NO SOUND
after AMP but before factory harness = NO SOUND
After HU but before AMP = SOUND PLAYS ... WTF?
I get out my multimeter and start testing wires:
After HU but before AMP = constant yellow works, 12V ign work, blue/white remote turn-on works (reads 12v), all speak wire (read 6.5 V for each +/-)
After AMP but before factory harness results = constant yellow (12v), Red ign (12v), blue/white (12v), all speaker wire + read 2.5v and all - read 0.03v.
If I plug that same Harness/AMP/HU combo back into Car #1 it works fine.
WTF, WTF, WTF? I've been working on this for 2 days and I have been pulling my hair out. I'm out of ideas and am going to beat something with a hammer.
HELP PLEASE.
EDIT: video detailing the problem ...
http://www.youtube.com/watch?v=gq9VequIDOc
(2x) 1995 Subaru Impreza WRX's
(2x) Oxygen O'car HU
(2x) Alpine KTP445 amps
Alpine KTP445 is a class D amp placed between the HU and the car's factory radio wiring harness.
I cut and soldered the KTP445 in place between the deck and factory harness on both amps identically since they are the same HU and same vehicle. So now I have 2 identical amps wired up to identical wiring harnesses to identical decks in two of the same make, model, year cars.
Installed HU#1 and AMP#1 into car #1 (Black WRX wagon), sounds fantastic.
Installed HU#2 and AMP#1 into Car #2 (White STi sedan), no sound from speakers. but deck powers up
Installed HU#2 and AMP#2 into Car #1, Sounds fantastic.
Installed HU#1 and AMP#2 into Car #1 sounds fantastic.
Installed HU#2 and AMP#1 into Car #1 sounds fantastic.
Already know HU#1 and AMP#1 work great.
Installed HU#1 and AMP#1 into Car #2, NO SOUND. but deck powers up
Installed HU#1 and AMP#2 into Car #2 NO SOUND. but deck powers up
Installed HU#2 and AMP#1 into Car #2 NO SOUND. but deck powers up
Already know HU#2 and AMP#2 = NO WORKY but deck powers up
SO all combos work in Car#1 and NO combos work in car #2, I think it must be the car that is causing the problem. I look for blown fuses. Find nothing wrong, switch fuses around. No difference.
I test speakers at different location in the stream to find the source:
@ door = NO SOUND
after AMP but before factory harness = NO SOUND
After HU but before AMP = SOUND PLAYS ... WTF?
I get out my multimeter and start testing wires:
After HU but before AMP = constant yellow works, 12V ign work, blue/white remote turn-on works (reads 12v), all speak wire (read 6.5 V for each +/-)
After AMP but before factory harness results = constant yellow (12v), Red ign (12v), blue/white (12v), all speaker wire + read 2.5v and all - read 0.03v.
If I plug that same Harness/AMP/HU combo back into Car #1 it works fine.
WTF, WTF, WTF? I've been working on this for 2 days and I have been pulling my hair out. I'm out of ideas and am going to beat something with a hammer.
HELP PLEASE.
EDIT: video detailing the problem ...
http://www.youtube.com/watch?v=gq9VequIDOc