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tow bar
by G Walker - 24/08/26 06:52 PM
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Jun 14th, 2026
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Joined: Feb 2016
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Needs to Get Out More!
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Needs to Get Out More!
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Look behind the instruments on that side of bulkhead. There are two connectors sprouting out of chassis loom, a twenty pin (only 19 used) to instruments and the twelve pin to switches. It's this latter one I was referring to. If you are able to confirm the diode appropriate to the side not working when hazards selected is open circuit (as suggested above), then it can be replaced. A widely available 3 amp IN5404 should suffice.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Feb 2016
Posts: 8,656 Likes: 407
Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
Posts: 8,656 Likes: 407 |
Apologies for suspecting the TSM unit Biggle but it is notoriously unreliable. Applying a bit of logic pretty much the only component that would cause your issue are the diodes fitted to loom side contacts on the 12 pin instrument switch connector. Specifically pins 8 and 9. You haven't said as far as I can see which side is not working when hazards are selected but if its left check diode attached to pin 8 if right, diode attached to pin 9. These are needed to isolate left from right indicator feeds when hazards not in use and I suspect one has gone open circuit. Note polarity if replacing the wiring diagram shows black marked end (cathode) connecting to each of above mentioned pins. The other ends go to a common pin on connector probably pin 6, but this will be obvious when viewing connector. Having had a closer look at wiring diagram the two diodes are wired between the distribution splices (bombtails) and matching pins on 12 way switch connector, a distance of 3 to 4 inches beyond. So to clarify the diode feeding left hand indicators when hazards selected sits between pin 8 on connector and green/red cable splices and for right between pin 9 and green/white splices. The factory diodes are wired with the silver band (cathode) end connected to appropriate splice to conduct in that direction with black body coloured end to matching pin on connector, so ensure any replacement is wired accordingly. You will likely have to undo insulating tape or heat shrink to gain access to diodes for testing and replacement.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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