electrical problems for 1988 jaguar?

For running lights, please have check the wire connection for loosen.

For signal lights, please try use the hazard switch. If it's blinker, then a loosen wire connection on the switch at signal lever. If the signal doesn't blinker, it's the flasher, it might dirty - loosen - or worn.

Fuse problem, or control stock (aka the turn signal switch assembly)

If the headlight switch is at the end of the turn signal stalk, it could be a bad switch.

Could be fuse or flasher or relay problem. Turn hazard flasher on see if they work. All are connected.