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I think the advice on cleaning and tightening grounds is right on. I'll try to get you started on learning to use your meter to check for shorts and grounds.
1. First, remember never to try to measure resistance (ohms) with the power on. This will damage the meter. To be safe, you can disconnect the positive battery cable.
2. Use the meter set to measure X1 resistance. You should have an instruction manual with the meter.
3. The resistance from the chassis to the wire going to the chassis should be close to zero ohms. In a car, the chassis is called the ground. I usually find that ground connections measure 1 or 2 ohms because the test leads themselves don't make perfect contact. If you measure higher resistance than this, remove the wire from the chassis, scrape the connecting area on both the wire and the chassis and reconnect the wire tightly. I use a little silicone grease such as Sylglide on the connection to prevent corrosion. There are numerous ground connections in the Volvo. I would start by finding these, testing them, and repairing any bad ones.
4. A short circuit means that there is little or no resistance between two wires which should not connect at all. For example, I just fixed a problem in my old pick up truck which happened when two wires, which were touching, got hot. The heat melted the rubber insulation and the copper conductors inside the wires touched very lightly. The resistance of this short circuit was about 9 ohms and it really messed up the ignition system. Separating the two wires and taping them fixed the short circuit. It took me a day to find that short. Finding a short circuit often means starting with a circuit which shows a short, opening the circuit in the middle to measure which half has the short and then splitting that half and testing, etc. until you locate the spot where the short has happened. Pretty laborious sometimes.
If your Volvo has the wiring harness which deteriorates with age, you may have some shorts inside the harness. The Turbo's heat may make this worse. If that is the case, you may need to replace the whole harness. Try looking in the 700'900 FAQ for help on this.
'Hope this is helpful, good luck!
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