'81 Econoline left turn signal = L & R flash

Right signal works fine. Left signal triggers both left & right flashers so looks like emergency flasher turned on. From google search to an earlier
post this year, kind of suspecting the turn signal switch/controller in the steering column. Sound right?
TIA, Diane
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Mon, 04 Dec 2006 00:43:24 GMT, "dianedebuda"

Could be the turn signal switch - could also be an open ground at one the left-side turn signals, either the lamp-base to socket ground or the wire from the socket to chassis ground. This is far more common when you have a dual-filament lamp like the old 1034/1157 (or the new wedge-base IIRC 3157) that has a bright 'turn' filament and a dim 'marker/tail' filament in one bulb.
The power from the left signal goes through the 'turn' filament of the lamp but can't get to ground - so it goes through the left 'marker' filament of the same lamp and into the marker light circuit, across to the right marker lamp filament and lights it up, and then to the ground for the right lamp.
Can also happen this way (both sides blinking) if they use a small separate side-marker light on the fender with one filament that is wired *between* the Turn and Marker circuits on each side. These are the ones that normally blink on in sync with the turn signals during the day, and blink OFF in sync with the turn signals at night...
They count on one side or the other being off and grounded through the dark filament for the small side marker lamp to light, and if both have power at the same time the light goes out. Same symptom applies, if the ground is open on one side the power will sneak across to the other side to find a ground there.
One of the oddities from the way they wire cars.
--<< Bruce >>--
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.