Ok Progress… since I definitely and positively know each of the four relays and definite locations. And totally familiar with wire codes and color code key. I have focused on the needed relay feed tests . The “ Dip /main “ relay is fed fine from key turn .
The “Dip” relay however has zero voltage in all states . Key on or off . I’m checking for volts at the 12 v battery feed socket to relay. AND the 12v volt “Trigger” socket . Both dead 💀 with key on or off . Clearly this is part of issue . At least I know it’s not a relay ( kinda knew that , cause I changed them out many times ).
I was kinda surprised 😮, or was anticipating my test light to light up , from “ trigger” socket test ? Thinking the trigger 12v could still be present coming from the key on event ? It did not , and I just was surprised / bemused . Lol Even though the relay was definitely not getting the main 12v at that pin. So ? Means trigger AND relay feed originate / or string together from the same ( failed source ) . I’m going to remove rear of dash and delve into it tomorrow . Thanks 🙏
Not sure if you read my post on your "Relay" thread
here. You have now confirmed there is no power to the dip/main relay as I thought. Hopefully you did check for this with ignition and headlamp switch on though?
As previously suggested you need to be focusing in the area of the headlamp switch now and beyond if necessary to relay. Is the switch itself getting power for example? This is on the green cable from 12 way behind dash connector C31 and on pin 2, this carrying power in to headlamp switch and out on blue cable pin 3. Sorry don't know colours of cables to switch itself as only connector shown on schematic.
Regarding no trigger voltage to relay coil from TSM as you flick to main beam (default being dip beam) as you have found this is to be expected because the TSM relies on the same power feed that you presently don't have from headlamp switch - it's looped through at relay connection hence two blue wires. This avoids the possibility of relay coil remaining energised when headlamps not selected.
