Turn Signals NOT working...

[fmartinez1897]

How's it going guys, I recently came across a problem on my '88 924s. My turn signals aren't working. I get a solid green light after I've done the following:
-Replaced relay with a factory relay
-Replaced Fuses
-Replaced ALL the bulbs
-Checked the connections and secured them on the back of the fuse box

Not sure what else to try. I've seen a couple of other threads with people that have the same problem but I can't for the life of me figure it out. Anyone have suggestions? I don't think it's the switch because the green light wouldn't come on if the switch was busted. I've been scratching my head on this one for 3 weeks now. If anyone has a suggestion please lay it on me, this is driving me nuts! lol. Also, when I put the hazard switch, I get the same solid green light on the dash.

[honerboys]

check your flasher

[ditch68]

Check the wires that terminate at the bulb housings, and go back a bit. They are like 6" sections with waterproof plugs that facilitate removal of the front end. If they come loose, it acts as if the bulbs are burnt out.

That is on my '88 951, but it may be the same on yours.

Jeff

[Tom944]

Are you sure you put in a "flasher relay"?

[rhett]

Lets backtrack a bit...what was the problem that caused you to change all the items you listed? What did the flashers do beforehand? Have you tried the old flasher relay back to see if you get the same result?

If you are sure that the replacement relay is 100% compatible then it could be faulty (not unheard of). Also, when the solid green light comes on what are the bulbs in the indicators doing, are they on or off?

[BTERRY1]

for me i had luck spraying WD-40 in the actual switch on the steering column.

[nutless_neo]

I'm having the same sort of problem. My blinkers work sometimes - if at all - but only if I move the handle a few times. My issue started after I replaced my gauge pod (speedo, etc.) and had to remove the steering wheel.

[fmartinez1897]

Rhett: When I got the car I got the solid green light, being that I know little about this car I figured it was normal. Then I noticed the blinkers were not actually blinking. They just stay on. I Tried the relay because I'd seen some people with the same issue solve it with the relay. I went to the local porsche dealership and bought a flasher relay. Then I'd seen someone on here that had the issue solved by changing the bulbs. So, I went for the bulbs. Which most were corroded. So I cleaned the insides with a toothbrush before putting the new bulbs in. All the lights work but still no turn signal. Once again i checked the forum, and I saw to clean the grounds and it took me forever but I got to them, and cleaned them under the dash and a couple I'd seen around the car (under the hood). Then my logic told me "Maybe it's a loose wire?" so I made sure everything was plugged in nice and tight. Everything else in the car seems to work. But I'm still stuck on this. It's boggling me lol. Thanks again in advance

Jeff: I'll check that out, maybe that's the issue.

[rhett]

Hi Fernie...Weird problem, but need a bit more info. When you try to use the blinkers do only the lights on the side you choose actually come on, or do all of them come on?

Also, when you use the hazard switch, which lights come on then?

It is possible that you have a faulty hazard switch with a stuck contact. I don't see it being the turn switch on the steering column as it appears that it is trying to operate correctly. Do you have a spare hazard switch you could swap? You could remove the hazard switch, try a bit of WD40 and operate many times to clean the contacts, etc, this might be worth a try.

[fmartinez1897]

Thanks for the reply Rhett. When I turn the switch nothing happens with the lights, I just get the solid green light on the dash. I'll take your advice on the hazard switch. I have a spare can of CRC contact cleaner, would that be better? or just go with the wd-40? I also agree to it not being the switch so I haven't really bothered with that. I might have to order a hazard switch on ebay or something if it does happen to be the culprit.

[fmartinez1897]

also, is it a complicated procedure on replacing that switch?

[fmartinez1897]

Never mind, I got to the hazard switch. Not difficult to get to it just annoying to put it all back together lol. However, Wd-40'd the switch and nothing. Same Solid green light.

[rhett]

Hi again..vital piece of info about no lights at all, I did assume that they at least came on but didnt flash. So, that changes things a bit. I have looked at the circuit and there are a few things you can check and try. However, you will probably need a multimeter to check wire continuity and voltages, etc.

I have simplified the circuit diagram so that it only includes the important stuff:



As you can see, the hazard switch does play an important part.

There are two fuses involved Fuse 6 is in circuit when the hazard is operated, otherwise fuse 9 supplies the drive voltage for the indicator circuit. Therefore first thing to check is do you have +12V at these fuses.

The next thing is to check the hazard switch. Remove the flasher relay and check for +12V on the fuseboard terminal that connects to contact 49 of the relay. You should get +12V in both positions of the hazard switch.

Leave the flasher relay out and disconnect the battery positive terminal as you now need to make a few continuity and resistance checks.

Make sure the hazard switch is off and the indicator switch in the middle position (off) then measure the resistance between pin 49a of the relay and a good ground. It should be just the resistance of the green indicator bulb (10ohms - ish) pretty low. Then operate the indicator switch one side, this reading should change (get lower) if the bulbs and wiring for the selected side are good. Then try the other side, the reading should do the same. Put the indicator switch back to middle and try the hazard, the reading should go lower still.

If you dont get any changes then you have a continuity problem in the wiring, switches or bulbs. The flasher relay is load-dependent and will only flash if it sees a load (at least one bulb). So, I suspect that you will probably not get any resistance change reading at this point.

The next thing to do is remove the hazard switch from the dash to gain access to the wiring behind it. I am sure there is a thread in the forum to show you how to get at it. I can't remember and my car is an 88 944S - totally different!

Unplug the switch and check the continuity of the connections beween 49a on the fuseboard and 49a on the hazard switch connector - should be solid (very low ohms), if not there's your problem...

Otherwise, check from 49a to the R terminal on the hazard switch connector, this should be solid (very low ohms) when the indicator is moved to the right. If not (open circuit or high ohms) the indicator switch is faulty. Try the same test on the L terminal.

Finally, check the resistance between R and a good ground, this should measure just the bulbs on the rightside. Then do the same with the L terminal. If these readings are OC or high ohms then you have a wiring problem down to the bulbs, but I dont expect it to be in this area, as the problem remains the same whatever position the switches are in.

One other (careful) check you could do is to connect +12V to the R terminal and see if the rightside bulbs light up, then try the same on the L. However, only do this check if you are confident when working with wiring, etc. I can only advise what I would do to check, but I have been dealing with electronics all my working life!

Hope these checks help to shed some light on the problem, you never know it could just be a bad connection that will come good as you disconnect and re-connect the plugs on the switches - here's hoping!

Take care...

[fmartinez1897]

Alright I figured out how to remove the switch. Actually really easy with patience. Now, as far as my lights. They all light up, reverse lights, headlights, highbeams, parking lights and brake lights. They just don't blink when I hit the turn signal. I'll run through these checks that you recommended tomorrow since i'll have a whole day to really get down and do it. Thanks alot man I really appreciate it!

[spb525]

Originally Posted by fmartinez1897

Thanks for the reply Rhett. When I turn the switch nothing happens with the lights, I just get the solid green light on the dash. I'll take your advice on the hazard switch. I have a spare can of CRC contact cleaner, would that be better? or just go with the wd-40? I also agree to it not being the switch so I haven't really bothered with that. I might have to order a hazard switch on ebay or something if it does happen to be the culprit.

If you have not already fixed it I have just had the same problem, solid green light on the dash, I have the Instrument cluster out to change the film wiring sheet and unplugged the hazards, I didn't notice that the indicators were not working until I tried to test the instrument cluster reading the above posts for a solution I plugged them back in and hay presto, indicators are now working again, sounds like your hard switch is the problem

[Jamesh99]

I am having the same exact issue with my 83 944 but has now manifested to other gagues and power windows not working