Radio mod.

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The switch does seem to be overkill, rather than working more into the solution, why not use a switched jack (where inserting the connector makes the connection for your relay to 'switch' the aux-mod).

PS2, DIN, and similar connectors offer a few extra pins so that the conenction being "made" can act as your 'switch' as well.

Even a simple SCR could be used to hold-in your relay once activated (until the key is turned off...)

Sadly, I don't have the schematics at hand here, but there oughta just be a simple mechanical switch there for "tape=inserted", that may be perturbed for your purpose. I'll scour some images from a recent install and see if I can't offer more insight

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Thank you for your suggestions, I am trying not to drill into the audio console body to minimize water problems. The older type 1/4 jacks could be fitted with a weather boot but the mini types are hard to weatherize tho i will look into it. A circuit diagram would be nice tho.
Grayson.

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Hey guys... don't want to hijack the thread but there are lots and lots of iPOD and MP3 goodies and accessories intended for marine applications here... might be worth a look!

West Marine