Question about 2008 Volvo C70

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Volvo c70 battery keeps going flat, its a new one ,and had it tested theres no drain. i turned the light swutch to night is this right the car is new to me

Its a secound hand car 2008 model .noy sure where i should turn light switch to last hing at night

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Is the alternator charging. if it is then. I am guessing a light is coming on after you walk away. my truck did that. 2 hours later the lights would come on

Posted on Feb 11, 2015


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You just blindly replaced these parts? Were there fault codes that prompted you to think these parts are a problem, bet not. Was the fuel pressure checked when the problem occurred?

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My friend has a 2001 Volvo C70 that drains the battery constantly. She has replaced 2 batteries and is on her second alternator. It runs when boosted but turn it off and its dead. What can the problem...

The unfortunate thing is diagnostics DOES TAKE TIME. You need to set aside the time to be accurate.

Something for sure is draining the battery and methodical diagnosis is the only way to get it figured out. IF there were an open in the alternator to battery circuit, the new alternator would be damaged.

Pull the interior light and radio fuses, disconnect the negative battery and put a test light or volt meter in series with the cable and battery terminal. I expect the light will be lit or the voltage to be above .2 volts draw.... Disconnect the battery, remove one component, connect the battery test setup, and see if voltage drops or light goes out..... when it does, you have the offending system, so investigate that.

Be sure that you can garantee good ground between battery and everything....especially the engine.

Mar 16, 2011 | 2001 Volvo C70

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Won't hold a charge. Have had Alternator and Battery tested. I know I need a fuel pump. Is the fuel pump electric and is it in the gas tank? Lights are very dim. I charge the battery everynight. ...

If the lights are dim when the car is running, it is not charging well. Who tested the alternator? Is the alternator well grounded to the engine? I think those older alternators required a ground strap around the alternator mounting.
Though I suspect the problem is not a drain, the way to find the drain on this car is to disconnect one battery cable and put a voltmeter between the cable and the battery terminal. If it is draining, you will see 12.6 volts on the meter. If you see only 3 or 4 volts, it is not draining.
(note that this technique does not work on newer cars with computers, and some dash clocks can confound this test)
Assuming that you see full battery voltage, start pulling fuses until the voltage showing on the meter drops. When that happens, you are on the right track. At least you will know what fuse to pull at night to keep it from draining.

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Battery drains over night,never had this problem,radio will not operate with code,tried several times ,still no go, did battery problem start because of this radio problem?

This does not sound like a draw issue. Have the battery charged and load tested. This will give you a definative answer so you are not chasing your tail, so to speak. Let me know the results.

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My battery keeps going down in my volvowhat do i look for?

Get the battery tested, have the voltage checked, electrolytic solution, corrosion on the terminals, if it checks out, you must have a clock running, or tom-tom, something draining the battery. A clock will do it fast, but usually it will be a weak battery. Hope this helps.

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Broken Sun Visors on my C70 Convertible

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Battery keeps going flat

Your experiencing what is called a battery draw,and you are correct with the key off something is remaining on draining the battery.I dont have a manual,but offer this.take a ohm meter put it on 10 remove the battery ground place the ohm meter between the ground cable and the battery terminal.mark or remember where you pull the fuses from,and begin removing them one at a time,each time look to see it the ohm reading drop to 0.If you find it this way you will know which circuit to search for the draw.most of the time the clock is the problem.O door jam switch,or the dome light can be the problem,hope this helps.

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sounds like there is a wire grounding out

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