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it's normal for the alarm to flash a red light at night.
yes the alarm could go west and draw too much current.
things such as a glove box light or trunk light that don't shut off come to mind being more likely.
look when it's dark at night for those two common culprits.
take the junk out of your glove box first.
the next step is to measure current drain in each fuse circuit, see:
https://www.brickboard.com/RWD/volvo/1685010/940/960/980/V90/S90/review_harbor_freight_30a_fuse_circuit_tester_67724.html
you can measure each fuse circuit with everything off to look for the culprit.
keep all doors shut when measuring.
there is some small base current flow to run ecu's clock etc, that should add up to a small number ,
say 0.015 mA - 0.025 mA. there is some normal low variable baseline current flow.
you can rule out gremlins on fused circuits quickly with this nice tool.
you verify each circuit quickly looking for 0.000 or a low number.
the total of all off the individual readings some low number: 0.025 mA? maximum.
i don't know this number for a healthy s80 maybe it's 0.019mA ?
the higher this number the faster your battery drains.
find a fuse drawing current above baseline and then you know what circuit
the trouble is in. a glove box light might be 0.090 mA, more for a trunk light.
maybe the glove box light is on all the time and you can't see it at night
for some reason?
the meter wont be fooled, and you should quickly find the problem circuit.
there can be current drain in non fused circuits too, when if the above fails,
you pull off a battery cable and hook up the suitable ammeter in series with
the battery and cable you removed. you can look at total system current flow.
this method has some dangers such as if someone decides to power up a window while you have your VOM on the low scale.
this hopefully will only blow out the VOM fuse.
this method is used to find things such as pinched wires or faulty components.
good luck, bill
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