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Idk if this will help at all, but my buddy replaced his turn signal switch and the mechanic didnt tighten the wire harness all the way together on the collumn, sobit popped halfway off and meased with his lights. He had running lights, no brake lights, only the right blinker. With his running lights off, he had the left brake light and nothing else. Make sure that plug is secure.
The rear flashers do work.
There was a 30amp fuse that I replaced with a new 20amp fuse as labeled fuse box.Brushed it clean and tested both terminals.The Bottom terminal read 12 volts but the top terminal went crazy without a proper reading. Be explicit. What do you mean by, "the top terminal went crazy without a proper reading?" When the brake fuse is installed, both fuse box terminals should measure battery voltage. Power runs from battery positive through the fuse to the brake switch then proceeds on to the turn signal switch. The brake lights won't illuminate if power is interrupted anywhere along that route.I located the brake light switch (very cool to see how that works by the way)But how do I test it? The brake switch has two terminals. One terminal should measure constant B+. The remaining terminal should measure zero until you depress the brake pedal, then measure B+.I do have a hitch on the truck. The fused wire that runs rearward from the junction block may be for an electric trailer brake, or a charge lead for a trailer mounted battery.
It's probably easier (more convenient) to probe the wire entry point of the connector, no? Orange is B+, white is load.There sure is a lot of wire sectioning under the dash. What is that all about?
Thanks BD.Are there any safety precautions when jumping? Don't let the jumper arc to ground (any adjacent metal).I read online I could use a paper clip; is this so? Should I attach the paper clip to a splinter of wood to avoid shock? ...paperclip, wire, even a small screwdriver placed across the prongs of the switch. As long as your hands aren't sweaty and you aren't wearing any metallic hand/wrist jewelry or watch your chances of receiving a "shock" are about the same as handling a 9-volt transistor radio battery.Think it's a good buy? Seems straight forward, no? Seems that way.https://www.am-autoparts.com/1973/Chevy/suburban-c20/brake-light-switch/AM-2886901275/840689.html?rawFit=840689-1973&gclid=Cj0KCQjw5arMBRDzARIsAAqmJewijFpc8X-jh5jJAPkdKu9t9QqyyiZL6fRfhL0adkem58w1jDHDhccaAgzhEALw_wcBI've seen the same one for $25 instead of $5