Electrical mystery: Headlamps, horn, hazard flashers. (1 Viewer)

[Jonathan Hanson]

On the way home from Overland Expo West yesterday we realized that the headlamps, horn, and hazard flashers on our '93 HZJ75 had stopped working. The three fuses that control those items are all fine, but there is no power to them. I can't figure out what would fail that would simultaneously cut off the feed to those two wires (one to the two headlamp fuses, another to the horn/hazard). The running lights work, so do the turn signals. Is there a relay in the circuit that could fail and cause this? Thanks for any direction.

Jonathan

 

[RhinoRig]

Check your fusible link. Power should always be on for those three items and comes from one of two links. You can check for power at the panel and if there is none, then it must be the link. No relays involved.

 

[Jonathan Hanson]

Check your fusible link. Power should always be on for those three items and comes from one of two links. You can check for power at the panel and if there is none, then it must be the link. No relays involved.

Thank you; I'll check that. I didn't know the 70-Series even had fusible links.

 

[prwillard2]

Thank you; I'll check that. I didn't know the 70-Series even had fusible links.

This is the partsouq diagram for my FZJ75. Put your VIN in and search "fusible" and it will show you the part and diagram.

https://partsouq.com/en/catalog/genuine/unit?c=Toyota&ssd=%24%2AKwE1ARAeX0pOb0lhRVBnN215WV5AMT4zMiA-DHwkdSI9JFshcnIvJTw1fXlzaGceK25kb2UiPTItITg5KCU8Izg1NjMhcnIlaSQ7Ij80MTpuZQQle392bmJBeHw5OCU8I0ZVR0xGfHxubnUjOiVAW0lpZXw3NDY5NzIjL3wzLyU8Izc_NzIwbnJgJWtiIj0kR1kUZ3lLUCxNVVNXIXJyKm5iIzozMHwAAAAAnX5Xpg%3D%3D%24&vid=0&cid=1&uid=366178&q=FZJ75-0027904

 

[OGBeno]

If it is the fusible link Jonathan, the part number will be 82627-60020 for replacement. Available anywhere Toyota parts are sold.

 

[RhinoRig]

The bigger question: why? What caused it to blow? Damn gremlins

 

[Jonathan Hanson]

Thank you for the links to the Partsouq diagram and the part number (and Onur, glad to finally meet face to face this weekend!).

Indeed, if it is the fusible link that will just shift the mystery.

 

[joekatana]

Did you check the headlights relay already ?

 

[Jonathan Hanson]

Well it doesn't appear to be a fusible link issue—I have power downstream from these three battery connections. I'll check for the headlamp relay, but wouldn't that be downstream from the fuse? And it still wouldn't explain the horn failing at the same time.

 

[Jonathan Hanson]

The worst possible thing then happened: Everything just started working again. Now I have zero clues as to the cause, and no guarantees the headlamps won't just blink off on a dark highway.

 

[jblueridge]

Are those connections at the battery as they were from the factory? It looks a bit like mine that I did myself (but I have like 5 wires there now).
I would dissect the one that feeds those ignition-independent devices: horn, lights and flashers.
I had my whole truck dead for a week until I realized that a non-factory battery lead was corroded and not making contact (invisibly inside insulation sheath).

 

[Jonathan Hanson]

Those are as they were when we bought the vehicle, except I've added some protection (heat-shrink, etc.). I'll check the one that feeds the headlamps etc., thanks.