Wiring harness burned up in my 84 Volvo 240 wagon - I got it rewired mostly - finally got the key to crank it, but then it kep trying to restart and my son wasn't sure what to do - ended up burning up the starter. Any help with wiring diagrams for this vehicle - or should I bypass the key switch and pu in a start button belw the dash for him?

SOURCE: Start Then Stall

The platinum wire in your air-mass assembly is shot. This happens with most 240/740 models at least once in the lifetime of the vehicle. Find a good used air-mass meter with the same stock number (50-75 dollars), and replace it---that should take care of it.

P.S.
Save your self the money of the rear harness---It will just break again and only serves the rear window wiper/squirter and cyclops light.

SOURCE: starting a 1984 240 DL Volvo wagon after sitting in a garage for 5 years

Replace engine oil and filter, air filter and fuel filter.
Drain the fuel tank and add fresh fuel.
Remove the spark plugs and put a squirt of oil in each cylinder. Remove coil lead and crank engine until oil pressure comes up.(light goes out),
replace coil lead and start engine.. it will blow smoke for first few minutes. Check trans fluid, brake fluid etc before driving. Theres a good chance the brakes will need an overhaul.

SOURCE: Just bought a '92 volvo 240 station wagon. Drove

you may want to check the fuel pump relay. this is a common problem

SOURCE: No power to injectors on 1984 Volvo 240 DL New wiring harness

ok you must see what is missing. an injector requires 12volts to operate. the 12+ should be constant when key on and engine on or off,and the ground pulses. check both ways and see whats not there. if you have no pulse then ecm,cam sensor, or wiring faulty. is power+ is gone, then you have wiring trouble wich is the easier soulution. check and let us know

SOURCE: my 1990 volvo 240 wagon shuts off while driving

There is a 25 amp fuse on the driver side inner fender. check the fuse holder for corrosion. replace if needed.