Have you checked the FAQ?
Try a Volvo web site in Sweden, you are probably not the only ones to order this system.
Magnets are magnets, they have a north and south pole. Get a bar or horse shoe magnet and try to activate/deactivate the alarm with one of those. Try both ends.
A much smaller relay in the ignition system, as would one in the starter solenoid wiring would do the job instead of one between the battery and the starter. Those smaller circuits should be checked first.
Can you see the wires to the magnetic switch? Pull them out and try the starter with them disconnected or shorted, the only choices for that small rectangular thing.
The first thing that I would try would be connecting a remote starter switch between the battery and starter solenoid,
This is a small simple momentary switch that sends 12 volts to the solenoid - actually, almost any 12 volt switch will probably work as long as you shut it off after the starter turns over.
Mechanics use them to turn the motor over when adjusting valves or doing a compression check.
If the starter operates with this switch, you might try it with the ignition on - the car might start.
A second option if the remote starter switch doesn't work - but a dangerous one if done wrong - would be to hook one jumper cable to the battery and hook another to the hot side of the starter - then with some great sparks, connect them together.
This would check the solenoid and the starter - possible culprits.
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'96 855R,'64 PV544 driver, '67 P1800 basket case, '12 XC70, the first three are mine, heh, heh, 525,000 miles put on 10 bricks
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