Hi all.

When I first got my 1988 300SEL, the left front turn signal bulb was blown, which was setting off the blown bulb warning lamp on the instrument panel and I was getting the fast blinking on the right side.

I replaced the bulb and all seems fine, but I still get an occasional warning of a blown bulb and the fast blinking, BUT this time, BOTH front and rear signal are working. Whats strange is it will blink normal for about 5 times, then flash fast for about 10, then slow for a few times, then fast, etc? The bulbs are tight and the connections seem fine, because the lights are working. The left side works perfectly.

Does anyone have any clue as to whats going on? Faulty sensor or flasher?

Thanks!

might want to check your flasher switch out. Check for corrison and bad grounds as well at the signals.

__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

Wow, that was a fast reply!

Where is the flasher switch located? Thanks.

Did you buy the correct bulbs for the car? If they have a brass base they are most likely NOT the correct bulbs. The correct ones will typicaly have a silver base. The brass based US spec bulbs can have differnt current ratings than the European spec bulbs despite sharing the same socket footprint. The brass based bulbs can cause problems with the blinker, bulb warning, and cruise control. Making sure you have the right bulbs is the first step. A good test is to swap bulbs with the right side and see in the problem follows or stays with the left side.

__________________

90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
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PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

Thanks. Well, I was in Wal-Mart when I bought them. I bought the ones that the computer stated it needed. Maybe I need a different brand? I think the base was silver, not brass.

I will check it out though.

check to see if the headlight and fog light harnesses are correct plugged in. in my haste one day, i switched them. I had fast blinking madness for a few days until I dug in there and had a "Doh" moment. ricers would want to race me...j/k.

I was thinking wattage....if its not right it will blink too fast or too slow....my dad's SD had non-german bulbs in it when we bought it and it had too slow of a blink. German bulbs fixed the problem.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

I've most often had erratic rapid flashing when I had a bulb socket loose or corroded.

My quick fix was to remove the bulb, then use a set of needle nose pliers to pull the center contact up enough to put more tension in it so that it held the bulb securely when installed again.

__________________
-Josh
Testing the cheap Mercedes axiom, one bolt at a time...

Also, In addition, if you get stumped....check the lamps/holders for corrosion build up .. a real problem in those and they add more Resistance to the circuit..causing the flasher to weird out on you..

swap the bulbs with the other side to isolate the fault.
This is how i sorted mine .
mak
300se

bring up a wiring diagram of the exterior lighting or turn signals and on there it will tell you, dont know off the top my head.

__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

Main fuse box under hood, in false bulkhead area.

MB# 2018210247

http://catalog.peachparts.com/item.wws?sku=W0133-1618689








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