Question about 1991 Toyota MR2

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91 camry loses electrical power.bat and alt. check good.

Can usually jump start, but eventually happens again.

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If you don't already own one and are in any country that imports Chinese stuff, buy a cheap digital multimeter, specs are not important but make sure it has a 10 amp range (normally extra input for this). They can be had for under $20 US at any auto parts (chain) store or if in the US and find 'Harbor Freight' in your telephone book, they have these for under $10 all the time; I've bought several for $3.00 each for our various vehicles. 

You need to have everything turned off (that you know of). Remove one fuse at a time, replacing each after checking, set the meter on the 10 amp range and measure directly across the open fuse contacts. I would advise pluggin in one lead and only tapping the second contact briefly to see if the current drain exceeds 10 amps; this range is NOT fused and several seconds exposure to 15 amps or more will fry the guts of the meter.
If you find nothing drawing more than tenths of an amp, then you will have to check any aftermarket (non-factory) items separately since often power amplifiers or convertors will use their own fuse or even an inline fuse.
This may take some time to find the 'leak' but not as much as having someone jump-start you all the time.     
BTW, alternators can have a single defective diode in them that will draw current with the engine off and this can amount to an amp or two, enough to gradually discharge even a healthy battery. Most batteries have ratings of 60 AH or less and a 2 amp drain that doesn't bother them for a few hours can become a killer over a couple of days since that two amps is ~ each hour so 48 hours equal one really dead battery. 

Posted on Nov 16, 2008

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The alt can check good and still be bad....ive had it happen several times have it rechecked and or get a new one

Posted on Nov 16, 2008

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