Have a headlight and windscreen wiper intermittent problem with my 1989 Syncro. Both together are either working or not working. But they seem to always work with engine off and ignition on. If they are not working with engine running I turn the engine off, turn the headlights on, then start the engine and they stay working. Bit of a mystery. Any thoughts. I understand there is no headlight relay on these vehicles.
Could be an ignition switch faulty which is common. Just do a temporary swap with your spare one. 5 minute job.