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P80 Parasitic draw, 150 mA. [ glovebox light ] Topic is solved

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
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mecheng
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Joined: 27 March 2014
Year and Model: 1998 Volvo S70 T5
Location: Ontario, Canada
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Re: P80 Parasitic draw, 150 mA. [ glovebox light ]

Post by mecheng »

abscate wrote: 21 Oct 2018, 05:57 Calculations

150mA * 24 hours* 12 volts is 40 watt hours per day. Your battery capacity is roughly 960 watt hours, so one week should have been about a 25% drained battery with no use. Maybe get that battery on a charger for a bit and check alternator output ?
I’ve never seen amp watts used, interesting.
Amp hours is published and for this size battery
It is either 45 or 60 amp hours. In a week, it would use 25 amp hours, which is either 50% or close to it.

I have one of those smart battery chargers. The car starts ok now, hopefully the battery is ok but I may have shortened its life.
1998 Volvo S70 T5 - SE - 240km - Sold July 2018
1997 Volvo 850 GLT - 190km
Boost is my drug of choice

mecheng
Posts: 1271
Joined: 27 March 2014
Year and Model: 1998 Volvo S70 T5
Location: Ontario, Canada
Has thanked: 15 times
Been thanked: 21 times

Post by mecheng »

crlande wrote: 21 Oct 2018, 04:20 I think it was RSPI who once put his camera inside the glove box to see if light went out. A forum search show several instances of the door not making contact with switch.
I did that last year when I noticed the cell voltage would drop after siting but it passed the test. I think the switch is intermittent and unless you let the car sit a few days and it’s cold out you would never know. The glove box doesn’t need a light, so I just put a flash light in there so she doesn’t haunt me again
1998 Volvo S70 T5 - SE - 240km - Sold July 2018
1997 Volvo 850 GLT - 190km
Boost is my drug of choice

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