Turn Signals acting like hazards

[hstreeter]

My 1999 Ranger when turning on either turn signal causes both dash indicators and all four exterior lights to flash. Any Ideas?

 

[Uncle Gump]

Typically when weird stuff happens with lighting like you have going on... it's a poor ground. I would ensure your forward lamp ground is clean and tight first.

But the turn and hazard light have a common point... the multifunction switch. That would be my second guess. It could be shorted internally.

 

[RonD]

Turn and 4-ways have different fuses
Turn signal is key on only fuse
4-way is full time 12v fuse

If flashing stops with key off and turn signal on then all 4 were running off the turn signal fuse

You can get your 1999 Owners manual here to ID those fuses: https://www.therangerstation.com/manuals/

In 1995 and up there is only 1 Flasher unit, turn and 4-way share it
But with separate wiring inside so unlikely to be the issue, but not impossible

As said the Multi-function switch(turn signal stalk) is the crossover for turn and 4-way
Do the 4-ways work normally?
Key off and on

In 1999 there are 2 wires out of Multi-function switch, one for each side, the dash indicators are spliced to these wires
Turn signal should only connect 1 wire to the Flasher, the left side or the right side
4-ways connect all both wires to Flasher


If it was a bad ground out at one of the bulbs I would expect a report of one side being much dimmer than the other side, which you didn't notice

My bet would be Multi-function switch

EDIT:
If you have a Trailer light connector, especially DIY, then that could short BOTH wires together, and you would get what you have