Bose System Power Relay Location

Ingo Rautenberg IRautenberg at
Sat Dec 13 22:50:29 EST 2003

Re: Bose System Power Relay LocationDave,

No need.  Yes, I'd found it in the meantime and found something else that is interesting (thanks for pointing out where it is in the manual, Dave).  After removing the relay and hooking up the voltmeter, it would still show 11.5+ volts (even with battery disconnected).  So I knew there had to be a capacitor somewhere -- and there is (was):  The free area of the Distribution adaptors at the bottom of the footwell auxiliary relay housing.  No mention in ETKA of the part number (not known), but it's a choke (PN# 443 903 547 A) with attached capacitor that is attached to a red three-prong plug and has three wires going to it:  Red w/orange stripe, red w/ black stripe and brown.  If I plugged in a Bose speaker amp, it would drain the capacitor.  If not, the capacitor would hold it's charge.  As to whether the capacitor is used for anything else, I don't know.  If I'm reading the unit correctly, it's rated at 12 A (max 20 A / 2min).  Wonder if it's also use din the 200...

  ----- Original Message ----- 
  From: Carol, Dave, and Zach Weiss 
  To: 'Ingo Rautenberg' ; V8 List 
  Sent: Saturday, December 13, 2003 10:01 PM
  Subject: Re: Bose System Power Relay Location

  Ingo wrote:


  See Bentley for the 200 on page 91.23  It talks about Speaker Relay, J225

  with a drawing that shows (apparently) the general area this Relay should be

  (at least for the 200).  Besides the thorough wire wrapping job, everything

  is tucked in soo close  I feel I really have to tear apart much of the sound

  deadening material, unscrew numerous brackets, etc.

  This appears to be entirely skipped in the V8 Audi shop manual (at least the

  1990 version).


  Speaker Relay J225 is 19 on Auxiliary Relay Box II, red relay socket.  See manual page 97-60-2.  Aux relays (right footwell) are shown on page 97-40-1.  This relay is also listed on Service Pub. 89-1 V-8 Main Wiring Diagram, page 2 of 82 (was in my bound manual).  The relay is on current tracks 753 and 754.  I haven't gone down to the garage to verify the manual, though.

  Dave Weiss

  V8 5-speed

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