ejsimcox Posted September 19, 2013 Report Share Posted September 19, 2013 I have a 2005 S60R. I went out the other day to start it, and the battery was dead. Tested the alternator with and without load. It was fine. I put a charge on the battery, and was able to drive it to the mechanic to have it checked. The car felt fine at idle and underway. Battery was full with a nice surface charge. Alternator fine. Drove for 40 mintes without issue. Again, it was fine under idle and underway. Parked for two hours. then it wouldn't start. Battery totally drained again. The window wouldn't even go down. Recevied a jump start in the parking lot. However, this time the enigine was hesitating. I barely made it to the other end of the parking lot before the engine died. Tried another jumpstart. I could get it to start, but could never get enough power to put it in drive and move. Other fact: about 3 months ago, the security module started going out. I have been getting the security system console message. I have ben meaning to change out the security module myself, as this is a known issue. Could the security module be affecting the battery that aggressively, or screwing with the computer? Other than that, I have not had any computer or electrical issues. Any ideas? Thanks! Link to comment Share on other sites More sharing options...
Mike_Driver Posted September 20, 2013 Report Share Posted September 20, 2013 The most common battery drain problems are caused by interior lights left on ( check visor lights ) or door catch (do all your doors lock and unlock properly). If the micro switch is bad in a door catch the light will normally stay on so you may want to fold your rear seats down and check the trunk light too. The siren module is the common component that fails in the alarm system, they can cause the alarm to go off now and then and maybe only the flashers blink and the horn will not sound so you might not even realize it went off at one point. The last thing on these cars is the alternator may test good but the voltage regulator in the alternator may be bad. The voltage regulator is replaceable and is a somewhat common failure in the charging system. Link to comment Share on other sites More sharing options...
Keaton85 Posted September 20, 2013 Report Share Posted September 20, 2013 The alarm module just needs a battery, which can be homemade for a lot cheaper then the whole unit. Link to comment Share on other sites More sharing options...
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