Finished wiring up the E-codes on my 745 today, which is the third Volvo I've done this on.
I don't think it's worth the bother of wiring a redundancy. Have not needed to worry about it after 5 years.
Indeed, you can keep it all in the engine bay.
Here are some pics of the relays wired up in the '87 245:
http://www.ohio.edu/people/ridgely/for-buck/
-Ryan
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Athens, Ohio 1987 245 DL 324k, Dog-hauler 1990 245 DL 142k M47, E-codes, GT Sways/Braces, Dracos, A-cam 1990 744GLE 189K 16-valve 1991 745 GL 304k
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