The resistor goes between the phone mute line and the constant +12V
line. If you're using the ISO connector I'd see if I could coerce
(carefully) the individual 'plugs' out of the plastic connector
(I had to do the same as I installed my MkI in my VW as VW reverses
pin 4 and 7, switched and constant +12V, as well as splicing in
another connector for the CD/Radio deck) and solder the resistor to
the outermost end of the 'plugs' and the reseating the plugs in the
connector. Then cover the exposed legs of the resistor with for
instance electricians tape - I'd also use that to told the resistor
against the connector body, keeping it out of harms way.
If you solder, be careful not to overheat and melt stuff...
A simpler approach is to use those crimp connectors that let you tap a
new wire into an existing run - the existing runs would be the wires
for +12V and mute sense, the new ones the legs of the resistor.
Cover with electricians tape or shrink tubing. I don't know how well
these connectors would work with a solid wire like the legs of a
resistor - I don't think they work all that well even with normal wire.
/Michael
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/Michael