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Check as many items as you can. you mention wipers and engine, both items that depend on the ignition switch.
Do the parking lights work?
I do not know anything about Volvo's protective devices, but most cars have a circuit breaker, fuse, or fuse wire protecting the ignition circuit. Some cars have more than one device. Fuse wires can be dificult to find.
What were you working on?
Shorting your battery to ground should not really affect your car, its not like you zapped it with high voltage, you just reduced the voltage. You might approach the problem as a no start issue.
Were you charging the battery? That can cause troubles.
If the battery is near the power stage, check the connections and ground on it, I caused a problem for our '90 744 Turbo when I repaired the battery cable, and evidently bumped the power stage, causing a bad connection.
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96 855R, 95 855,854, 90 744 Ti - 310,000 miles driven
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