The subject of ecodes cannot come up without mentioning Dan Sterns website.
I highly recommend talking to him as soon as you decide to install ecodes. His relay kits make the whole project worth it. He is a one-man operation so things can take a little time, contact him first.
This site has a nice write up of the process and some other good pics and diagrams.
I did purchase my eCodes from FCP, but I purchased through eBay and saved a bit over what they sell them for retail online. edit: Ahh that's right I found an auction like this one, and waited to make the only bid near the end and got them for $250 with free shipping instead of $299.
I tapped power directly off of the alternator and mounted my relays on the body sheet metal across from it and forward of the exhaust heat shield, wiring then runs to passenger headlamp, and through through in front of the radiator to drivers headlamp, and grounds out at the battery and another body grounding point on the sidewall there.
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