total loss of electrical power.

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baskie

Well-known member
Joined
Dec 1, 2005
Messages
250
Started the 3 hour drive from Belfast to Donegal last night at about 5pm, in really thick fog.

At the end of a motorway section I pulled into a garage and all the warning lights came on, I turned the engine off, tried to start it but the batt had dead. Previously we'd had everything switched on: fog lights, headlights, heater, CD player and aircon.

Eventually bump started it, left it running and tried the batt again, totally flat, not taking or holding charge. I thought maybe the batt was just fecked, it was extremely cold last night.

So, bumped it again and started the 20 mile trip back to Belfast, once the engine was running everything was OK to start with then it all started to go wrong. Eventually we had no electrical power at all, just a bit of light out the front and rear headlights, no dashboard lights or indicators or anything. I can tell you, driving on a motorway in thick fog with little in the way of lights is very scary!

Once in Belfast and in traffic I found that when sitting at lights and revving the engine hard I had a bit of light, but at normal revving speed (ie driving along at 30pmh ish) we had nothing.

The engine sounded like a bag of spanners so I'm guessing all the engine management systems were dead also. All I can is thank god diesels don't need elelctrics to run else we'd have been totally screwed on the hard shoulder of a fast moving motorway in thick fog with no lights, that don't even bear thinking about.

So, what is the problem? I'm thinking alternator, or might it just be a dead battery?

BTW- It's a 2003 2.7TDi.

Ta.

Oh ya, also I was curious if we did the right thing in the eyes of the law (ie- driving on a motorway with little in the way of headlights or tail lights in thick fog as opposed to parking up on the hard shoulder and preying no one decided to use the same bit of hard shoulder and didn't see the lightless car until it was too late) so I asked a traffic cop friend. He said it's a 50/50 situation and each cop would have used their own judgement, but in general he agreed, better to limp the car off the motorway even if the lights were low than leave it in total darkness on the hard shoulder just waiting to cause a pile up. So there you go!
 
Almost certainly alternator, you don't need a battery to run a car once the engine has started.
 
Figured, thanks.

Anyone got a replacement cost for them?

(Money on cars i can do without at the mo!)
 
Hi Baskie if your is any thing like mine it won't take you long as it's only 3 bolts to replace it. Will be able to confirm this soon as i'm about to freeze to death & change my water pump :roll:
 
LOL.

Good luck with that, I'm tuck up nice and cozy inside :)
 
Baskie,

Have you checked you still have a fan belt driving your alternator.? If that’s ok then check the connections on the back of it before you shell out on a new one. It may be worth checking the fuses I think there is a large one for the charging system it may be 100amp.
 
my alternator only pushes out 11.5 v when on load so i need to sort one out i think.
at the moment i carry a booster kit in the back and try and trickle charge the battery at weekends if i can.
 
Car into the garage today as I need it fixed fast and have no time to look at it myself. They reckon the belt is done, very worn and not turning the alternator enough.

Here's hoping, as I can really do without spending a lot of fixing it at the mo.
 
New belt on, and when the engine is revv'd to about 2000 the alternator is putting out about 14v at the batt terminals, as soon as the heater, lights and a few other bits are on the output at the batt terminal is only about 12.6 when revv'd really hard. Guy in the garage says it needs to be about 13.5 -14.5 min.

Is he correct?

Any advice welcome, cus I've just seen the price of a new alternator! Is it norm for them to go so soon?
 
baskie said:
New belt on, and when the engine is revv'd to about 2000 the alternator is putting out about 14v at the batt terminals, as soon as the heater, lights and a few other bits are on the output at the batt terminal is only about 12.6 when revv'd really hard. Guy in the garage says it needs to be about 13.5 -14.5 min.

Is he correct?

Any advice welcome, cus I've just seen the price of a new alternator! Is it norm for them to go so soon?


at tick over you should have approx 13volts min, 13.6 to 14.6 is the tollerence, there should be very little fluctuation between revving and tickover, try the reading directly form the alternator terminal on the rear, too get the most accurate reading.

i would guess the alternator is on its way out if it is droping that much.
 
Thanks for that, the alternator is off and being sent tomorrow to a company who services and repairs them, will be cheaper than a new one, I hope by a lot.

Thanks for the advice on the thread folks, as usual my recently paid membership has already paid for itself.

Steve
 
To be honest with you here, I cant understand a garage just using a voltmeter reading to condemn the alternator, they should have tested with an amp meter, that would tell them, if with all the loads on the battery was discharging or being maintained by the alternator.
 
Toolbox said:
To be honest with you here, I cant understand a garage just using a voltmeter reading to condemn the alternator, they should have tested with an amp meter, that would tell them, if with all the loads on the battery was discharging or being maintained by the alternator.[/
quote]

you do have a point, but if the alternator is mearly at 12ish volts then it is doing nothing to charge the system, it is mearly keeping things stable at opperating voltage, so i would replace it just based on that.

if the fault had been that 14.4v was present but on application of all electrical items the lights dimmed drastically fan slows down and had a progression down then i would check the amperage too.

8)
 
All sorted now, the alternator got a service from a local company, cost £50, then on top of that the price of two new belts and some albour to the garage for removal, refitting, which shouldn't be too high.

So all in, other than a screwed up weekend away without the kids, no drama.

Thanks as ever for the advice above. Saved me a few quid.
 

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