If you own a Daihatsu Delta (whether the legendary 1500cc BU111 workhorse or the later R60 / R80 series cab-over), you’ve likely stared at its wiring diagram and felt a mix of respect and mild dread. It looks like a tangled nest of colored lines in the service manual. But here’s the secret: It was built in an era (late 70s through early 90s) before multiplexed networks and body control modules took over.

The diagram shows the resistor block has 2 or 3 terminals. On "High" speed, the resistor is bypassed. If the fan works on "High" but not on "Low" or "Medium," the resistor block is faulty. (A common Delta issue—resistors corrode open).

The alternator wiring on older Deltas

Even if the diagram shows a ground symbol, physically find the ground bolt (often under the dashboard, passenger side). Remove it, sand the metal, and reattach.