- Joined
- Aug 25, 2024
- Messages
- 5
- Location
- Baltimore, ON, Canada
- First name
- Richard
Machinery:
Zetor 7745
Hi Everyone, I am going crazy trying to figure out an issue with new rear turn signal//brake light/hazard lamps on my late 80's Zetor 7745T. I replaced the front turn signal/headlamp/marker lamps as well and replaced all the bulbs and the multi-function signal/horn/beam flash stalk on the dash. The fronts were easy as they are two wires each and coloured to match the existing wires. They each have a single element bulb for turn signal and a single element bulb for the white "headlamps" and everything works correctly. The rears are a bit different as they each contain a one element turn signal and two element brake/marker bulb. There are three wires (a forth wire for license plate on one side and a forth wire for a work lamp on the other side as well) and my schematic indicates green/yellow to the signal and the brown and blue wires on the left side and two black on the right side to the brake light (the wires coming from the new lamp are all black but it is easy to determine the single element wire from the other two and my meter indicated the correct wire for the brake part of the two element bulb so I am pretty sure it is correct). I had some initial issues with dim bulbs and some random craziness but after removing all the fixtures and grinding the metal beneath clean and wiring a dedicated ground to the mounting posts and to the body I am able to get almost everything working with the key inserted but not turned (position "0"). The rear turn signals work correctly but both the turn signal and brake bulb on each side flash (the brake bulb is very weak and only one of the two elements is on) when I put the hazard lights on (this could be normal but I am not sure).
The problem I have is that as soon as I turn the key to the first or second position (position "1" or "2") to activate cab lights and other functions the turn signals stop working and the relay under the dash goes silent (as well as the dash indicator lamp no longer flashing). When I turn the key back to position "0" everything works again as described above. I have tried changing the wiring around on the rear lamps but either the brake light flashes when the signal is turned on or nothing lights up. The only thing I haven't done is run a separate ground wire right from the battery which I will try (I will update if anything changes) but I would expect dim lights or no lights rather than this issue. Could the relay be shorting out but only when the key is turned to on? I don't know how to check that. If it is defective I would think it would just not work. The previous owner definitely did some changes under the dash though.
I am at a loss and am hoping someone can help me. Please and thank you in advance for any help or suggestions.
The problem I have is that as soon as I turn the key to the first or second position (position "1" or "2") to activate cab lights and other functions the turn signals stop working and the relay under the dash goes silent (as well as the dash indicator lamp no longer flashing). When I turn the key back to position "0" everything works again as described above. I have tried changing the wiring around on the rear lamps but either the brake light flashes when the signal is turned on or nothing lights up. The only thing I haven't done is run a separate ground wire right from the battery which I will try (I will update if anything changes) but I would expect dim lights or no lights rather than this issue. Could the relay be shorting out but only when the key is turned to on? I don't know how to check that. If it is defective I would think it would just not work. The previous owner definitely did some changes under the dash though.
I am at a loss and am hoping someone can help me. Please and thank you in advance for any help or suggestions.