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Hey, welcome to the club.
Good advice so far to read, but you can only absorb so much without poking around on the hardware. Yeah, the rain could keep it from starting -- that's why WD-40 was developed in the first place.
When you're stumped, the basics of a running engine need to be reviewed. You need spark, fuel (fuel-air), and compression. But troubleshooting is all about doing the easiest tests first.
Because you already solved one no-start with a parts-car relay, you may want to verify that part of the equation first - fuel delivery. If you use a test light or multimeter, you can verify that relay is getting power from the 25A fuse up front by checking for 12V on the orange wire (key on) leading to the AMM. That's the easiest, quickest test to prove that fuse isn't dirty and at least half of the relay is completing the circuit.
In your '88 the fuel pump won't run unless the motor is turning and telling the ignition coil to generate spark. Don't even fret over the ceramic fuses by your left foot, as you can start and run this car with all of them missing; in fact you can drive across town that way if you don't get into trouble for no signal lights. However, one handy way to check the fuel pump, and bypass both the pump relay and its supply fuse is to use something to bridge the left side of fuse 4 and 6. If that gets the pump going, but doesn't help when starting the car, consider you may not have any spark. That's about the third-easiest thing, perhaps tied with disconnecting the AMM temporarily.
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Art Benstein near Baltimore
"I don't think you can get cold in Volvo 240 series. The AC can't do it and the heater won't let you." -darkdelta
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