Car sat for a bit - won't start? Not battery - MR2 Owners Club Message Board
 
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post #1 of 7 (permalink) Old April 13th, 2017, 21:56 Thread Starter
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Car sat for a bit - won't start? Not battery

Hi all,

Let my car sit for a few months, Sw20 JDM RHD, gen 2 3sgte. Had a battery a mate gave me, turned the key and it fired up first go.

Car ran for about 3 minutes and then started to idle funny and stall. Figured the alternator wasn't charging, even though I had a new one fitted about 6 months ago.

Put a known working battery out of another car to fire it up, and now when I turn the key I get nothing, can't won't crank at all.

Any suggestions on where I should start searching for the cause? Perhaps the starter relay - if there is one? If so where is it located?

Thanks for reading,

Kind regards,

Ryan
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post #2 of 7 (permalink) Old April 14th, 2017, 04:57
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Did you put the new battery in the correct way? Silly question I know but you never know.
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post #3 of 7 (permalink) Old April 14th, 2017, 09:34
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Corrosion on the battery terminals maybe? I ran into this on my MKI just a couple of days ago. Turn the key and it would just click, like the battery was almost completely dead. But I was pretty sure the battery was good. Cleaned the terminals, and it fired right up.


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post #4 of 7 (permalink) Old April 14th, 2017, 10:28
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I agree, most likely problem with connections or the known working battery, and likely a different problem than the initial stalling. Do the lights work, and do they dim when you try to engage the starter? If so, try measuring voltages, both between battery posts and between connectors.
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post #5 of 7 (permalink) Old April 14th, 2017, 11:56
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Check your grounds, esp the big ones in engine bay. You can easily 'ghetto rig' a temp ground between engine & chassis just to check. If you establish that you indeed have a bad ground, don't run the car 'till its addressed, many MR2s have been lost that way!
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post #6 of 7 (permalink) Old April 24th, 2017, 21:39 Thread Starter
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Hi all,

Finally got some time to have another look at this today.

Charged battery up to full last night, checked terminals for corrosion, checked connections on alternator where tight and belt tight. Had a bit of a look around for earth's but didn't look get too into it. Also checked starter motor connections.

Bit the bullet and turned the key and she started first go. Using my turbo timer I checked the voltage output and had a measly 12v at best, even when I revved it up to 3000 rpm. Got a multi meter out and confirmed reading at the battery terminals. Experimented with turning things on and off in the cabin and the voltage would drop down to 11.8V. Then I tried turning the headlights on...

And they went crazy - popping up and down, alternating left to right, like trying to do some crazy winking. I'm guessing this is just low voltage to the relay for the light motors, lights stayed on?

So looks like I only have a charging issue, thank goodness.

My first thought is to let it cool down and trace the wiring back to make sure a rat or some sort hasn't had a chew on it while its been sitting - the car had a new alternator fitted around about 12 months ago, and has been sitting for about 4 months. Will check the fuses first.

Do any of you have any recommendations besides that?
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post #7 of 7 (permalink) Old April 25th, 2017, 08:17
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Could be that your new alternator has failed, or could be that the wiring to it is bad. Aren't you getting a charge fail light?
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