[Mk2] [NA] possible alternator problem?

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willydc26
Posts: 40
Joined: Wed Sep 24, 2008 4:46 pm
Location: Ely

[Mk2] [NA] possible alternator problem?

Post by willydc26 »

today when i started the mr2, it started a little slow, but just thought it was because it hadnt been driven in a while. i turned on the stereo and it played a bit, but then died. because its a home install, i thought a wire was just loose, because it kept flickering on and off. we started down the road and everything seemed fine. when i turned on my blinkers, i noticed that my tachometer started to jump with each click of the blinker. thats when i started to check the dash, no idiot lights came on, but the battery was showing a few dashes into the dashed lines, out of the solid. i slowed down to do a u-turn and thats when the car died. i tried restarting, but nothing happened. now it sits on the side of the road down the street.

a little background. my wife says she started the car just fine yesterday. the engine was recently out for a clutch change. the speedometer hasnt worked since the engine was put back in, is this related to the alternator? the hazards indicated inside the car, but not outside. the alternator belt wasnt broken. the windows still roll up, but slowly.

is there anything i need to check? is there a sure diagnosis for this? if so, does anyone have the parts i am going to need? thanks for the help.
Lewis Jay
Posts: 2335
Joined: Wed May 18, 2005 11:37 am
Location: Cheshire

Re: [Mk2] [NA] possible alternator problem?

Post by Lewis Jay »

Sounds like a knackered battery.

Get the battery tested, fully charged, refitted then check charging voltage at the battery and straight from the alternator.

Report back once battery is checked and charge voltages checked.


Lewis.
jim55
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Joined: Mon Jun 09, 2008 7:30 pm
Location: south side glasgow

Re: [Mk2] [NA] possible alternator problem?

Post by jim55 »

get it running (jump/push start)and check the voltage across the batt terminals ,started/running it should b about 14-14.5v .if its not started its just the battery power ure measuring and the batt will prob b ran down if the alternator is goosed and not charging .so get it running and if its not as above its most likely your alternator :roll: (btw its an akward job) :thumleft:
willydc26
Posts: 40
Joined: Wed Sep 24, 2008 4:46 pm
Location: Ely

Re: [Mk2] [NA] possible alternator problem?

Post by willydc26 »

i dont know anywhere in my area that will test batteries, but i borrowed a battery charger from a friend. i took the battery out and charged it for several hours, and finally got a full charge light on the charger.

if i install the battery and get it running, will i just be able to watch the voltage gauge on the dash to watch the car die as it just sits there? how long will the car take to die if its a bad alternator?
Mr2_NA
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Joined: Sat Apr 26, 2008 6:47 pm
Location: Isle of Man

Re: [Mk2] [NA] possible alternator problem?

Post by Mr2_NA »

Mine lasted (on a brand new battery) 1 hr 23 minutes of driving with the stereo on, using indicaters and brakes etc... to give you some kind of idea

Just leaving it to idle will eventually remove all charge if the alternator is packed.
jim55
Posts: 255
Joined: Mon Jun 09, 2008 7:30 pm
Location: south side glasgow

Re: [Mk2] [NA] possible alternator problem?

Post by jim55 »

get a cheap voltmeter /tester (£5)and check it as said ,money well spent .youl use it for loads of stuff :thumleft:
willydc26
Posts: 40
Joined: Wed Sep 24, 2008 4:46 pm
Location: Ely

Re: [Mk2] [NA] possible alternator problem?

Post by willydc26 »

after some reading, it looks like it may have been a blown ecu/ig fuse in the engine compartment fuse box.
Mr2_NA
Posts: 973
Joined: Sat Apr 26, 2008 6:47 pm
Location: Isle of Man

Re: [Mk2] [NA] possible alternator problem?

Post by Mr2_NA »

Also get it back to the place that did your clutch to fix the speedometer since they broke it :thumleft:

Did you buy yourself a voltmeter and test across the terminals?

Id also check the alternator belt and the plug (give it a little wiggle and check that no earth wires have been removed around that area :clap:
willydc26
Posts: 40
Joined: Wed Sep 24, 2008 4:46 pm
Location: Ely

Re: [Mk2] [NA] possible alternator problem?

Post by willydc26 »

Mr2_NA wrote:Also get it back to the place that did your clutch to fix the speedometer since they broke it :thumleft:

Did you buy yourself a voltmeter and test across the terminals?

Id also check the alternator belt and the plug (give it a little wiggle and check that no earth wires have been removed around that area :clap:


haha, the place that did the clutch was my friend and i. so unfortunatly, im the one to blame :(
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