Well my 09 Precedent electric has this lighting system installed.
Headlights, brake lights, horn, tail lights and turn signals. Everything is working OK right now, except the brake lights.
The brakes are actuated by a small pressure activated strip switch that has been inserted just behind the rubber brake pedal pad. It's a very small switch. I have checked that out and with foot pressure applied the circuit is completed, and the brake lights should go on.
I located the brake relay behind the "instrument panel". It is an HDI-048D-A30PMS. It has 4 wires connected. Orange, Blue/White, Green/White, and Black. Two of the terminals are labeled com and NO. I have a Precedent Maintenance and Service manual and the wire color codes match exactly. I also found a nice schematic that shows that the orange and blue/white wires go to the coil and the green/white and blue wires come off the NO contacts. I confirmed with a VOM that the NO contacts are open. I measured the coil resistance and I believe it was/is? in the 2K vicinity.
I fiddled with the switch and actually had the brake lights working normally. I put everything back together and the brake lights do not work, again, although everything else still works normally. I shorted out the brake pedal pressure switch and the brake lights still did not work so I do not think that circuit/switch is the problem.
So......it certainly appears to me that the brake relay is the culprit.
I'm pretty certain that my cart does not have a timed relay in the circuit, but I am definitely open to suggestions in case I'm missing something.
What I would really like to do is find a replacement relay that has a timed circuit in the relay. Short of that I would just like to find out where I can purchase the relay. I prefer to purchase on-line due to my location.