I think I found the problem, or a symptom of the problem.
Connections to the motor are melted and corroded (Pictures attached)

Obviously I need a new motor. But what do I do about the connector? Would I have to replace the whole cable? Or can I just buy a new connector and solder it to existing wires?


Wiring & Connector to the wiper motor

Connector on the motor

 

When the connector and wiring burned on my 2013 cooling fans they simply cut back to where there was good wiring and then spliced in new wiring and a connector No need to replace all the wiring.

 

Wow and Holy Cow.

Glad you found it.

 

What would cause it to corrode so bad?

 

That wasn't the worst of it. This is.



I think the rubber drain failed and this motor was sitting in water. I replaced the motor and connector and things are back to normal.

Can someone comment why so many forums were talking about changing SJB when no signals from wiper switch goes through it?

 

I've been on this forum since 2007 and the 3 major issues I've seen with our Mustangs are

1. Water leak on the passenger side that causes the SJB to fail

2. Cracked and leaking plastic thermostat housing on the 4.0 V6

3. Breaking two piece OEM spark plugs during removal on the 2005 to 2008 (Job 1) 4.6 V8

Other than those, our Pony's have had a great track record.