My battery light stays on
- Thread starter Fezwald
- Start date
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not happy any ideas please ?
- Posts
- 3,275
- Location
- Rushden, Northants, UK
As Fanny says, you've managed to backfeed to ignition somehow, either through incorrect wiring or something along those lines.
The ignition light is grounded by the alternator when the engine is stopped, and when the ignition is on this gives a circuit to light the lamp.
When the alternator is running it generates a little above battery voltage so the ignition light has 12|V one end and 12V the other so it goes out.
To come on with the ignition turned off suggests that the ignition circuit is become live through something other than the switch.
Peter
The ignition light is grounded by the alternator when the engine is stopped, and when the ignition is on this gives a circuit to light the lamp.
When the alternator is running it generates a little above battery voltage so the ignition light has 12|V one end and 12V the other so it goes out.
To come on with the ignition turned off suggests that the ignition circuit is become live through something other than the switch.
Peter
okay
we supply + to alt via ignition and when engine off the alternator is - therefore + and - makes the light go on.
The Alternator needs 12 v + to excite the windings and for voltage regulation, when the alternator provides a charge we get
ignition + alternator output + so there is ++ not +- and light goes out.
it is more likely the ignition feed has become permanent live than faulty ign.
to test this if your alt has one plug, move wire retaining clip and remove plug, ignition off the 2 large terminals should have batt 12 v to earth
the small wire should have no 12v to earth with ignition off
