# Turn signal solid (doesn't flash) on '96 Sonoma. MF Switch not to blame **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** s-15jimmy, gmc\ **Created:** [March 11, 2014, 12:03am UTC](https://community.cartalk.com/t/turn-signal-solid-doesnt-flash-on-96-sonoma-mf-switch-not-to-blame/84131 "2014-03-11T00:03:10Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![james.gawley](https://avatars.discourse-cdn.com/v4/letter/j/ecccb3/32.png) [@james.gawley](https://community.cartalk.com/u/james.gawley)\ **Post date:** [March 11, 2014, 12:03am UTC](https://community.cartalk.com/t/turn-signal-solid-doesnt-flash-on-96-sonoma-mf-switch-not-to-blame/84131/1 "2014-03-11T00:03:10Z")
Hello All, I joined up because I’m stumped on a repair problem. My 1996 GMC Sonoma’s turn signals don’t flash. The signal bulbs do come on when I flip the switch and I can simulate a turning signal by clicking the switch up and down (which doesn’t make me feel silly at all, btw). All six bulbs appear to be working and I can’t find any blown fuses. I have also replaced the multifunction switch (which is what two different mechanics told me needed to be done). I’m all out of ideas, and I can’t afford a diagnostic at the repair shop right now. Do you all have any suggestions? Thanks for reading. ---
**Author:** ![shadowfax](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/shadowfax/32/13026_2.png) [@shadowfax](https://community.cartalk.com/u/shadowfax)\ **Post date:** [March 11, 2014, 12:36am UTC](https://community.cartalk.com/t/turn-signal-solid-doesnt-flash-on-96-sonoma-mf-switch-not-to-blame/84131/2 "2014-03-11T00:36:46Z")
The mechanics were wrong. Your multifunction switch was fine. Your flasher relay is bad. That’s what needs replacing. ---
**Author:** ![Whitey](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/whitey/32/24680_2.png) [@Whitey](https://community.cartalk.com/u/Whitey)\ **Post date:** [March 11, 2014, 12:51am UTC](https://community.cartalk.com/t/turn-signal-solid-doesnt-flash-on-96-sonoma-mf-switch-not-to-blame/84131/3 "2014-03-11T00:51:18Z")
Sometimes this happens because a bulb is burned out, but finding the burned out bulb isn’t easy if you have any two-stage bulbs. I encourage you to test every bulb that should flash by putting in a fresh bulb and seeing if it gets any better. On a car this old, that might include marker lights on the sides of your vehicles. Test each and every one. ---
**Author:** ![knfenimore](https://avatars.discourse-cdn.com/v4/letter/k/9fc348/32.png) [@knfenimore](https://community.cartalk.com/u/knfenimore)\ **Post date:** [March 11, 2014, 2:18am UTC](https://community.cartalk.com/t/turn-signal-solid-doesnt-flash-on-96-sonoma-mf-switch-not-to-blame/84131/4 "2014-03-11T02:18:48Z")
I agree with the flasher relay. Usually if a bulb is out just that side will not work. ---
**Author:** ![missileman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/missileman/32/1366_2.png) [@missileman](https://community.cartalk.com/u/missileman)\ **Post date:** [March 11, 2014, 2:38am UTC](https://community.cartalk.com/t/turn-signal-solid-doesnt-flash-on-96-sonoma-mf-switch-not-to-blame/84131/5 "2014-03-11T02:38:13Z")
Here’s another vote for bad flasher relay. ---
**Author:** ![james.gawley](https://avatars.discourse-cdn.com/v4/letter/j/ecccb3/32.png) [@james.gawley](https://community.cartalk.com/u/james.gawley)\ **Post date:** [March 11, 2014, 4:02am UTC](https://community.cartalk.com/t/turn-signal-solid-doesnt-flash-on-96-sonoma-mf-switch-not-to-blame/84131/6 "2014-03-11T04:02:36Z")
You guys were absolutely right. It was a bad flasher relay. Thanks so much!