Mistral Posted August 13 Share Posted August 13 My S204 (59 plate) was scheduled for a MOT last week, and the day before to the appointment, the near-side rear indicator malfunctioned, accompanied by a notification on the dashboard. Upon inspecting the rear of the light, I saw that the brown earth wire in the connecting connector had completely burned out, accompanied by a charred pin, despite another earth wire being connected to the bodywork and lighting unit. I opted to get an additional n/s/r light unit along with a new plug and harness cables from MB Newcastle and eBay. Upon connecting the new connector to the old wire, the indicator functions; however, the flasher in the cluster operates at double the speed. Inquiry? Is there a relay or rear SAM problem preventing the cluster from flashing in synchrony with the external indicator? Will it still pass the MOT scheduled for tomorrow? The indicator functions correctly; however, the internal flasher operates at an accelerated rate. Desire to resolve this issue prior to listing it for sale. Quote Link to comment Share on other sites More sharing options...
BEERMAN Posted August 13 Share Posted August 13 It is presumed that if the bulbs possess the appropriate flash rate (60-120 flashes per minute), then they should comply with the MOT requirements. Quote Link to comment Share on other sites More sharing options...
Mistral Posted August 13 Author Share Posted August 13 I will ascertain the information tomorrow. Quote Link to comment Share on other sites More sharing options...
Mistral Posted August 13 Author Share Posted August 13 MOT failure. It seems that the flashing indication at the back of the vehicle is an emergency signal. I have not encountered it before, but I am always eager to acquire knowledge. Seeking to contact an auto electrician suggested by the proprietor of the MOT station. There has been no success so far. He had been on vacation and returned on August 11th. Quote Link to comment Share on other sites More sharing options...
Mistral Posted August 13 Author Share Posted August 13 Engaged an automotive electrician. He identified the issue immediately. I temporarily used Wago connectors to link the wires from the harness to the new plug. Incorrect. It took the individual 20 minutes to disassemble my connectors and accurately solder and heat-shrink the connections. Completely encased in harness tape and £85 poorer. Returned to the MOT station, where a pass was granted after a brief inspection. Now available for immediate sale. Quote Link to comment Share on other sites More sharing options...
BEERMAN Posted August 13 Share Posted August 13 Unusual...I often use Wago 221 and 222 series connectors at work and have never had any issues with them. Did your electrician specify the problem? Quote Link to comment Share on other sites More sharing options...
Mistral Posted August 13 Author Share Posted August 13 Connecting the wire from the old loom to the new plug lead and inserting it into a Wago will not provide an accurate signal to the SAM. He demonstrated on his multimeter that no voltage was present in the wago. Removing it and appropriately soldering and heat-shrinking is the optimal approach. I planned to do that but erroneously believed that momentarily combining them in a wago would suffice. All is good, and I will be informed for future reference. Quote Link to comment Share on other sites More sharing options...
BEERMAN Posted August 13 Share Posted August 13 It is peculiar, although it is fortunate that you have resolved the issue. Quote Link to comment Share on other sites More sharing options...
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