My 1990 Loyale won't start, and it appears to be due to an electrical problem.
Symptoms: Weak power to accessories when ignition is in "accessory" mode. Weaker power, and sometimes no power, when ignition is in "on" mode. Car does not start, and accessories lose power completely when ignition is in "start" mode.
Testing: So far, I have done the following: checked battery voltage, checked battery connections, checked fuses, checked fusible links, tested six relays for switching and continuity (4 above the fuse box and 2 above the ECM), tested ignition switch for appropriate continuity at the different key positions, partially tested steering column switches for continuity (the diagram in the Haynes manual confuses me; nevertheless, I disconnected the steering column switches and the problem remains.) I have not noticed loose grounds or frayed wires, but perhaps I have missed some.
There are a couple of interesting items to note. First, when I activate the switch for the hazard flashers, the lights do not operate and a buzzing sounds. I have disconnected the power to the flashers module, and this of course silences the buzzing sound, but the original electrical issue remains. Second, occasionally when I turn on the parking lights via the steering column switch, the needle on the tachometer jumps - this is all without the engine running!
It's a mystery to me - hopefully someone out there can point me in the right direction. Thank you!