Right turn signal causes both front and rear wipers to start.....

[Bill D. Drummer]

On my 1989 740 Turbo wagon, when I filp the turn signal to make a
right turn my wipers start. I have to cycle through the different
speeds before they will stop. Has anyone had a simillar problem ?
It looks like to replace the switches the steering wheel would have to
come off.
I hope I don't have to do that.
Bill D. Drummer
Staten Island, NY

 

[TWC]

my 240 had this similar problem a month ago, the wiper start moving once i
turn on the dim light and the wiper will stop once the main headlight is
turn on.
Finally , i find a grounding wire was loosen,its under the wiper water
bottle.
After this wire is fix ,all trouble was gone.
So , I suggest that checking all  grounding wire first.

"Bill D. Drummer" ¼g¤J¡G

 

[James Sweet]

On my 1989 740 Turbo wagon, when I filp the turn signal to make a
right turn my wipers start. I have to cycle through the different
speeds before they will stop. Has anyone had a simillar problem ?
It looks like to replace the switches the steering wheel would have to
come off.
I hope I don't have to do that.
Bill D. Drummer
Staten Island, NY

As someone else said, check the grounds first, but if you do have to replace
the switches it's very easy, yes the steering wheel has to come off but for
that you simply pop off the pad and remove one bolt, and the wheel pulls
straight off.

 

[Him]

I got a great deal on my 86 245 because the last owner could not figure out
this same problem ... neither could his mechanic.

I asked here and was directed to a ground screw on the front wall in the
headlight area where several ground lines come together and are connected to
the body. I found the connection corroded and redid it ... problem solved.

The past owner offered me double what I paid for it to get it back .... I'm
still driving it.

I'd look for a simular problem on your 740.

Good luck.