You probably have the older 6pin round style. If the chord is in good shape, installing a new 7-pin style plug on the truck end is not a big deal. I had to do it on my 68 Trade Wind. If you do change the plug, just be sure to check each wire's function. Wiring diagrams for which pin does what are readily available. I did have to change a couple of connections at the trailer end of mine so that the plug and truck wiring and the trailer all were in synch. and would conform to the current industry standard.. That way if someone else pulls the trailer all the lights trailer breaks will work as they should.
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Bruce & Rachel
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68 Trade Wind
2001 Toyota Tundra
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