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Trouble-shoot SAS TA850C in 07 Escape


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calgaryxlt 
Member - Posts: 2
Member spacespace
Joined: December 31, 2006
Posted: December 31, 2006 at 2:07 PM / IP Logged  

Sorry, here's the post without formatting:

Hi, we just purchased a SAS TA850C (8” amplified sub) for installation into a 2007 Ford Escape with the standard 4 speaker 6 disc stock CD/MP3 player.  Installation was completed using a Stinger amp kit.  The power lead is fused and runs directly from the battery and reads 12v at the sub’s wiring harness.  Ground is solid and runs directly into an unpainted chassis bolt.  The remote power wire is patched into the switched accessory wire on the head unit and reads 12v at the sub wiring harness when the head unit is turned on, 0v when the head unit is off. The high level inputs are connected to the head units stock wiring harness as follows

Right Rear Spkr (-) Orange w/ Maroon Stripe

Right Rear Spkr (+) Black w/ Purple Stripe Purple
Left Rear Spkr (-) Brown w/ Yellow Stripe
Left Rear Spkr (+) Gray w/ Lite Blue Stripe

Small voltage readings are obtained from both pairs of high input wires when the stereo is in operation and the high level input wires are clearly carrying a signal as they run an old 6x9 that I had laying about.

The amplified sub does not function even after adjustment of the gain and completion of the phasing procedure recommended in the install book.  The sub/amp unit is not defective as I can get it to operate on 2 other cars with both RCA and speaker level inputs.
I have been trouble shooting this simple install for the last 3 days without success!  I’d be really grateful if you can offer me some advice on this.

flobee4 
Silver - Posts: 585
Silver spacespace
Joined: January 02, 2004
Location: United States
Posted: December 31, 2006 at 6:28 PM / IP Logged  
just for kicks - try removing the remote wire coming from the headunit at the subwoofer and jump your constant 12volts to the remote wire on the sub.  Maybe, just maybe the factory headunit is not suppling enough current to turn on the amp.  you never mentioned if the amps power light is coming on or not when in the escape, so thats what came to my mind. good luck, Frank
calgaryxlt 
Member - Posts: 2
Member spacespace
Joined: December 31, 2006
Posted: January 01, 2007 at 4:44 PM / IP Logged  

Thank-you very much for the help.

The power light was coming on.  However, I moved the ground and managed to get the amp to work, sort of.  It would seem that there is maybe some kind of feedback occurring through the speaker level inputs as I blew the fuse for the head unit. After replacing the fuse, if I leave only one side of the speaker level input wires hooked up the system functions (although with a fair amount of noise and reduced output), however as soon as I put the other side into the amp it sounds much better, but when I shut off the car and restart it I cannot get sound from any speakers at all (zero sound from the entire system) until I unhook the speaker level inputs from the amp.

I also tried a line output converter to avoid the high level inputs and I got an oscillating "thud-thud-thud" from the system.  I swapped the left and right wires and then the polarity and still got the oscillating noise.  I’ve checked to ensure I have the correct output wires tapped but I understand that Ford is notorious for changing wire colors (However, I also checked the PIN placement at the rear of the head unit from a Scosche wiring kit so I’m pretty sure I’m on the correct rear speaker wires).

I also tried disconnecting the remote power lead and jumped the amp from the main power lead and it didn’t solve the problem. It's amazing that such a simple instal could be so frustrating! Any further advice you may have would be greatly appreciated. BTW Happy New Year.


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