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Lucky 4 U I happen to have my factory shop manual sitting by my computer and I have had the same problem with my 90 4Runner. The color wires are blue with white stripe (hot) and green with red stripe (ground via the horn switch). The wires are routed thru the right front fender area, if you remove the inner fender liner you will see it very close to the marker light harness. The horn is mounted behind the grille near the battery on the pass. side. The harness runs behind the battery and down inside the fender. You will need to convert the new horns if they are single terminal type. Toyota ground switches the horns and thus you will find 12 v constant on the Blue/White wire. Converting the horns is easy, you just need a relay and a bit of electrical knowledge. Good Luck!

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Me Tarzan u ? Favorite tool?
Monkey wrench!
I am the original shade tree mechanic
 
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