When running under cruise control (factory) in my 89 v-6 Raider, if I use the turn signals to change lanes, the cruise will cut off. This only happens when the turn signal is pushed far enough to hold or "lock" into place. If I push it just far enough to make lights blink, it will stay. I changed the multi function switch with another from a donor (used) and it did not change.

Has anyone else experienced this? I know I could have two bad switches, but not sure what or how to check.

Thanks

Dave

It happens in my 89 LWB when I am only making right lane changes on the highway.. and I noticed it (SEEMS) speed related, if I'm doing over 55 it has never done it to me.

It's very annoying.

Mine too, sometimes. Both my stalks move a little when either is touched, like the mounting screws are loose. That may trigger the cancel function on the cruise or make an intermittent circuit, OR, there may be a backflow of current from the tail lights to the brake light switch, and then by a short to the cruise cancel switch if it's separate.

Glad(?) to see I'm not alone. Has anyone out there cured this? My turn signals are slow and will stop, too. They'll blink again if I put it in neutral or turn off the a/c. I thought the cruise thing might be voltage (alt) related but messing with electrical loads on the highway wouldn't cut off the cruise only the turn signals would. I've considered the tailight / brakelight backfeed thing but haven't gotten a schematic yet to check that avenue. "Most" but not all vehicles have a different switch or circuit within the brake switch to cancel the cruise. Again I haven't checked yet.

Anyone else?

Dave

did you check your wiring at the top end by the switches? Also at the bottom of your sterring column cover where they branch out? I believe that is the only 2 places where the signal wires and cruise wires actually come close or touch. I had a bad/slow/always on signal issue and the wire was rubbed clean in one little spot and was grounding. It drove me nuts for 5 days. <img src="/forums/images/graemlins/shiner.gif" alt="" />

Well, I went and read up on the cruise system, and while I didn't find your problem, I found some interesting stuff.

With 31's, I've had a hard time staying out of a 4-3 downshift in the hills in the 89 v6, and when it downshifts for about the thrid time, it doesn't want to upshift even after you crest the rise, unless you hit the set/coast button. I found out why it won't upshift (after about the 40th [exageration of the gross sort] time I'd set the TV cable length). There are aparently two power transistors in the o/d relay box in the ground path for the relay coil. If you get downshifts too often, the ecu cruise circuits kill the o/d for about 10-15 seconds by sending a zap to one of the power transistors in the o/d relay. I think another part of my problem is in the adjustment of the throttle cables at the cruise actuator cable drum.

From a pretty quick look at the circuits, I'd check the brake switch, which has two switches inside. One is NO and is the brake light switch. The second is NC and when interrupted by braking, kills the cruise set speed memory. Also check per Macka above at the lower column connectors and wires in the column.

I don't have cruise control, but I did experience the slow/hung turn signal syndrome. A new flasher cured it.... in my case it was not at all alternator related. I haven't looked at the schematic for the C/C to see if there's a common circuit with the flasher, but it's possible they at least share a ground.

Eddy - have you installed the lockup tranny yet? It should give you about 200 more rpms at cruise over the non-lockup KM148 and get you into the cam curve - should help a little with the 4-3 downshift on hills.

Frank

hmmm I think that little short broke 2 no 3 turn signal relays... I wish I knew what causes it because now my cruise doesn't work at all. <img src="/forums/images/graemlins/angry.gif" alt="" />

I would look for a short or problem in the rear tail lights as one of the stop light bulbs is used for the turn signal and the stop light will disengage the cruise control. I had the same thing happen on an Audi and it was a short in the tail light wiring.

Funny how the little things get you. The old addage about checking the cheap things first is usually true. I added this little piece of advice to my car info binder. Probably save me some agravation down the road.