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1st Gen Ram Tech'93 & older Rams: This section is for TECHNICAL discussions only, that involve 1993 Rams and older. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
this might help you troubleshoot the what is going on. i think this should be the same for a 77 even tho it sound like you may possibly need a new turn signal switch or to pull it all to find the broken wire.