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Yes, the battery has been tested and maintains a full charge.
The Volvo operates with the lights set to always be on low beam. To start the car, I have to toggle the switch for the high beams. The high beams flash and I turn the key in the ignition. The car starts. But, after driving for 50 to 100 miles and with the engine warm, if I turn off the engine I can flash the high beams but the engine will not turnover.
Hope this helps!
When the car is hot, I can pull back on the cruise control stalk to the left of the steering wheel to flash the high beams. The low beam lights are on. The information lights are all on. And, the engine will not crank. When the engine does crank, when the engine is either cold or not very warm due to a trip around town, the engine cranks and the engine starts. From there on the car operates great!
If I could find the aftermarket alarm under the hood I would attempt to disable it, however, I have looked on the firewall and see nothing that looks like a switch, so, I expect I will need to have a mechanic look at it.
I have mentioned this to them before over the last 10 years and the answer is always the same, "Bring it back when it is creating the problem!" To do this I would have to drive a long way and because the problem is intermittent, I can arrive and the car will just start like there is no problem.
But, let's assume the aftermarket alarm starter kill is not the culprit. What would be the next possible cause of this, if anything?
Will the computer register any error codes that a mechanic may use to understand the problem?