raycov

why as my battery warning light gone out, i checked my battery with a volt meter and its low,the car was running fine what do you reckon as happened
cheers

xr2wishy

iTrader: (2)

bulb may have gone and battery won't be charging.
or the alternator needs a new rectifier pack.

martysmartie

iTrader: (1)

Will defo be the thin blue wire on the back of the alternator this is the earth for the bulb and is common for it to break so it will need repairing, it is actually very important as it's part of the charging circuit that excites the field windings so at the moment it's not charging at all. Revving to around 4K will also start charging.

Martin

raycov

my battery light does not come on at all,i thouht if the blue wire was broke the battery warning light stays on

martysmartie

iTrader: (1)

No it WON'T illuminate at all since it has no earth.

Martin

raycov

been under the car this morniing stripped lagging tape of the wires etc but cannot see any breaks .started the car but still no warning light so like you say its not charging what would you do next
ray

conor.rst

iTrader: (3)

Bulbs prob gone again this is a common problem. take the top casing from the steering colum off and then the surrounding from the dials and the dials them self and you can get behind there and change the bulb.

you might need to go into the bay and push the speedo cable abit.

raycov

cheers i will try it tomorrow by the way what type of bulb is it
cheers

martysmartie

iTrader: (1)

Probably what he ^^ says then, it has to be one of these two only other possibility which would be very strange is if the live to the bulb has gone astray.

Not sure of the type of bulb but on Sierra it has a white plastic knob on the end, imagine yours would be similar (The same as rest of warning lights, bar ABS) which you twist so you can then remove it (Two lugs holding it) it would just be a standard 12V low wattage bulb.

NB With ignition off and 12V sent down the blue wire the bulb should illuminate.

Martin

essexRSTSouthend

I had this problem.you mostly find the connection faulty on the metal strips where the bulb sits.give that a fiddle,swap light bulbs round to see if that helps.i changed everything on mine just to find it to be a dodgy connection on metal strip.so i half turned it and it worked.

raycov

just tried what mart said but the light will still not illuminate

Karlos G

iTrader: (4)

Have you actually checked for 12v at the bulb, and that the blue wire earths out?

martysmartie

iTrader: (1)

Then it will either be the bulb itself or the live track to it on the PCB, more than likely the bulb so as said change with another such as parking brake light to test.

Martin

raycov

i will check to see if there 12 volts at the bulb in the morning,how do you check if the blue wire earths out
ray

raycov

right then,took the bulb out checked it nothing wrong with it, checked the circuit board where the bulb gets its power and there is power there too,what do you do next
ray

martysmartie

iTrader: (1)

Then it HAS to be a break or bad connection in the blue wire, when you looked at it did you actually remove the connector as well? You need to make sure it's free from corrosion.

You need to have +12V at this wire with ignition on.

Martin

raycov

martin
so when i touch the blue wire with my volt meter with ignition on it should read 12 volts
ray

martysmartie

iTrader: (1)

Yep you got it may be a shade under as you have the ignition on so things are using power.

Martin

raycov

done the volt test ,there is know power with the ignition on the blue wire connector on the alternator,then when i put a live wire to the blue there was still no illumination battery warning light on the dash
ray

martysmartie

iTrader: (1)

Then it has to be a break in the blue wire most likely further back and make sure inside the connector is not corroded, you now have two options, either trace the wire back and try and repair or just run a seperate new wire from back of alt to the dash which IMO would be easier.

To be 100% certain you could perform a continuity test on the wire.

Martin

raycov

martin where would you connect the wire to the back of the dash
or how do you do the continuity test
ray

martysmartie

iTrader: (1)

Theres a setting on the meter for it, you simply connect one end of the meter one end and the other end to other end of the wire, you would need another piece of wire to elonggate one end as otherwise it won't reach. It should beep and give a resistance reading if there is a connnection.

You would have to splice it into the connector where the exciting blue wire goes dash end.

Martin

raycov

cheers martin i will try it tomorrow and let you know what went on
ray

raycov

sorted,i do not where the bliue wire broke,.but when i ran a wire from the altanator to the blue wire in the blue multi connector at the back of the dash yes power to the battery warning light at last
cherrs martin top geeza
thanks

martysmartie

iTrader: (1)

No problem, glad it's sorted.

Martin