Regarding the price of an AMM, I meant to say that they typically cost about $35 uesed. -eBay is a great source if you don't have a local salvage yard with the parts you need.

Regarding the section: You may not have one. Your Fuel Injection Relay could be supplying power for the entire fuel system without the use of a seperate Radio Supression Relay. Some of the early 740/760 vehicles were fitted with the RSRs at the dealerships, some came fitted on the assembly line, but it wasn't until the late 90s that they were standard on all 700/900 vehicles.
I meant to say that it wasn't until the late 80s when the 700 vehicles came standard with Radio Supression Relays. I almost want to say '87 or '88 was the first year that they all came with both an RSR and an auxilary cooling fan relay. The cooling fan relay was mounted in the relay panel with the rest of the relays on some of the very early 700 series vehicles.

If you don't have power to the ignition coil, just trace the powerpath backwards using a Volvo Green Wiring Diagrams Service Manual (often on eBay for about $10). I'd assume that would take you back to the Main Fuel Injection Relay (white relay on left side of 2nd row in relay panel), with maybe a stop or two along the way.