Volvo Repair: Fuel Injection Relay HOT, fuel injection system, seat bottom

Question
I have a 87 740 Turbo. I just replaced the Fuel Injection Relay, Ignition Amplifier, and several wires with lost or cracking insulation. The brown wire that connects Fuse #1 (Fuel Pump, Fuel Injection System) was burnt/melted at the terminal of the Fuel Injection Relay - and the Relay itself was burnt along its side. The wire holder that the relay plugs into was even melted at the brown wire termial and the terminal along side. I replaced everything, but my new relay is still getting very very HOT. Should this Fuel Injection relay become so hot. One more note, I cannot connect my fast idle switch, if I do the car's idle shoots up to 3000 rpm in Park, but will drop to 1000rpm in gear. I replaced the idle switch, still the same results. HELP!

Answer
Hello Chris,  Well sounds like theres a real strong current draw to pull through that relay, I would be checking may fuel pump for abnormal heat.Remember that the fuel is generally cool.Also because excess pressure may be at the root here,the known failure  of the fuel pressure reg. ,could be blocked up on the return sd. of things.Causing the fuel pump to 'pumping against itself' kinda thing.The ground pts. are  1. under the rear seat bottom,left sd. 2. at the intake manifold and there should be 1 or 2 braided wire grds.from the firewall to the last valve cover nuts.As for the idle problem, the 'idle motor' is maybe stuck in the 'wide open'position and cleaning it with carb cleaner can help.If not then replacement is in order.Thank you and good hunting!  PKD