My son has a 1998 Cherokee Sport and it has developed a new "quirk"

When he turns on either the right or left turn signal it turns on the emergency flashers. Going to tackle it this weekend - any suggestions where/what to look at first?

 

This is generally something caused by the flasher relay possibly going bad. This is a small relay that allows the lights to flash based upon current flow and a resistor inside that causes them to flash. When this is faulty, this will cause them to flash very slow, very fast, stay solid or they may be working erratically with the hazard lights. You may have a corrosion issue in one of the sockets or potentially a shorted out turn signal switch assembly too though, which is known to cause this same thing to occur on many vehicles.

 

Well, if it helps anyone else we found that the multi purpose switch was bad. $42 and about 45 minutes later he was up and running. Great project for him to diagnose and do the repair with dad supervision.

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Excellent! Thanks for reporting back!