If I get an electrical manual, I'll PDF it to anyone who asks, but have not found one yet for the right price.
To end the story with the mice: my buddy's aunt is diligent with her 4runner maintenance so before her surgery on her foot (could not drive for 2 months), she had the oil changed along with new wipers, air filter and new winter tires. Well, they had some new wet behind the ears kid changing everything and he was eating a hot dog while doing all of it. Part of the hot dog fell behind the air box and he never found it. Well the mice sure did. Guy fessed up, and the shop did all the work for free.
Moral of the story: don't eat around your 4runner's engine bay while performing maintenance.