Jump to content

Battery light.. AGAIN!


Recommended Posts

HI all I drive a 1992 escort RS2000

A couple of months ago my battery light came on and eventually the car wouldn’t start, I finally got it moving (new battery) and got it down to the local Mr. clutch to get a battery check done, they said the battery was fine but there was a charging error.


I left it with them for about half an hour and they said that the problem was that the battery connectors weren’t tight enough so they fixed that and said all was fine, it was charging correctly and everything was good.


Now this morning I fired her up to drive to work, it started fine but I noticed the battery light was on, though very dimly lit. I got to work turned it off and tried to fire it up again. It started first time but the battery light is still on.


Could this be something to do with the rain? Like could the belt be slipping? Often when it’s wet or cold and I have the wheels on full lock something will screech is the power steering on the same belt as the alternator?


Im hoping that I don’t need a new alternator as I have read that replacing it in the rs2k requires the engine being moved is this true?

Link to comment
Share on other sites

no you dont need to move the engine. may need to fiddle with the exahust manifold, power stering pump or something like that though.


get the charging signal checked. if its anything below 13.5v i think your alternator is going. if you got a new battery and thats knackered is should still be under warranty within the year.


normally battery light means low voltage. either battery or alternator mainly.

Link to comment
Share on other sites

Right, i just took it to get tested it was coming in at about 12.5 untill he turned on all the lights, heaters and all that stuff then it dropped to like 11 he said it could be that the battery was gone and not charging, that or that the alternator was knackered. Unfortunatley he couldent give me a definate answer so im still unsure what to do, i mean a new battery is like 70 quid but god knows how much a new alternator is! and i mean the alternator was replaced like last year so it shouldnt be dead already should it?
Link to comment
Share on other sites

the people you took it to obviously dont know how to test batterys or alternators,


for the battery you should disconnect it and do a drop test, a piece of equipment which puts it under load, and this would indicate if the battery is shagged, if voltage drops very quickly then battery is a dead one, if slowly drops and i mean slowly then the battery isnt at fault


As for the battery light, these come on either when battery is a shagged one, axillary belt has snapped or if the alternator has failed, there is a diode pack inside the alternator, the main diode is the zenor diode which acts as a one way clutch it only lets current go one way, if that packs up current will back feed causing the light to come up


to test the alternator is connect battery have it running, test while running, and test whilst under load, lights heaters etc. if i memba rightly 13.5v or above for idle with no load is good

12.7 or above for under load, anything less then alternator is shagged

Link to comment
Share on other sites

Ok Well i have had it tested again and apparently the alternator IS dead.. so looks like im in the market for a new one, apparently there bit of a pain to get hold of so far the cheapest one i have found was around £118 does this sound about right for one of these alternators?
Link to comment
Share on other sites

ok im under my car, i get the alternator bolts all off but the damn thing still wont budge!

then i notice that there is still something holding it in place but i have no idea how to remove it this is proberbly the worst description ever so here i took a picture




i cant figure out how the hell to get it out of there sorry for the bad pic

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...