Fast blinking turn signal + dash burned bulb indicator on - Mercedes-Benz Forum
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#1 (permalink) Old 05-06-2010, 04:13 PM
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Fast blinking turn signal + dash burned bulb indicator on

When I move the turn signal lever down (making a left turn) the left arrow on the dash blinks very fast. In addition the dash burned bulb indicator comes on. I checked the front and rear bulbs, they were good (not burned), they both blink.

Anyway, I went ahead and replaced the front turn signal bulb, and all the bulbs in the rear left cluster (turn signal, stop light, regular night light). I did not replace the reverse light bulb. I also sanded the contact points for all the bulbs.

Still, the left arrow on the dash blinks very fast and the dash burned bulb indicator comes on.

Any suggestions on where should I look next?

Guido
89 300SE, 109K miles
72 250C, 70K miles
05 Lexus GX470, 75K miles
08 Honda S2000, 11K miles
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#2 (permalink) Old 05-06-2010, 04:17 PM
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Make sure the light bulb bases are clean, this can cause it, also check the turn signal relay.
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#3 (permalink) Old 05-06-2010, 04:29 PM
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Originally Posted by jporter16 View Post
Make sure the light bulb bases are clean, this can cause it, also check the turn signal relay.
I lightly sanded the sockets. I installed new bulbs, I assumed they are clean. But I'll go out an clean them. Where is the turn signal relay located?

Thank you.

Guido
89 300SE, 109K miles
72 250C, 70K miles
05 Lexus GX470, 75K miles
08 Honda S2000, 11K miles
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#4 (permalink) Old 05-06-2010, 07:38 PM
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Turn signal relay in fuse/relay box relay B. Wiper motor runs off the same relay. If your wipers are messed up too then definitely the relay.

Last edited by liammarsh; 05-06-2010 at 07:42 PM. Reason: add
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#5 (permalink) Old 05-06-2010, 07:45 PM
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Assuming right turn works fine? What happens when you turn on the hazards?
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#6 (permalink) Old 05-07-2010, 01:37 AM
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Pop the trunk, signal left...flashing fast???.... Now Fiddle/manouver the entire light housing on the left. Lift up/pull away from the body etc. Earthing probs me thinks.
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#7 (permalink) Old 05-07-2010, 05:20 AM
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Originally Posted by liammarsh View Post
Assuming right turn works fine? What happens when you turn on the hazards?
right turn works fine. Hazards work fine. Wipers work fine. Only problem is the left turn flashes very fast. I failed NJ inspection because the left and right turn signals do not flash at the same interval.

Guido
89 300SE, 109K miles
72 250C, 70K miles
05 Lexus GX470, 75K miles
08 Honda S2000, 11K miles
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#8 (permalink) Old 05-07-2010, 05:22 AM
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Turn signal relay in fuse/relay box relay B. Wiper motor runs off the same relay. If your wipers are messed up too then definitely the relay.
I read on another post that the turn signal relay is located behind the instrument cluster. My car is an 89 300SE. Did they change the location?

Guido
89 300SE, 109K miles
72 250C, 70K miles
05 Lexus GX470, 75K miles
08 Honda S2000, 11K miles
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#9 (permalink) Old 05-07-2010, 05:23 AM
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Pop the trunk, signal left...flashing fast???.... Now Fiddle/manouver the entire light housing on the left. Lift up/pull away from the body etc. Earthing probs me thinks.
I'll work on finding ground problems over the weekend.
Thanks,

Guido
89 300SE, 109K miles
72 250C, 70K miles
05 Lexus GX470, 75K miles
08 Honda S2000, 11K miles
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#10 (permalink) Old 05-07-2010, 11:53 PM
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I once had a problem with a marker lamp that would never work, even with replacing the bulb. I replaced a large relay (its real long, biggest one in the fuse box. I think all the outside lights at one point make their way through that relay) and the marker light magically came back on. This may have something to do with it as well.

Get your timing chain and rails done like you should. I would know more than anyone!! The noise it makes when it goes will make you cry.
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