1990 XJ6 (4.0 L) Voltage Regulator

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Richard Short - 13 Nov 2003 02:20 GMT

Hello

My battery discharges if it's left connected to the wiring harness in
about 36 h.

A brief (~20 minute) charge at 8 Amp restores its strength.

The voltmeter reades constant charge (about 13 V) when the engine is
running.

If I disconnect the battery whilst the car is idle (e.g. over night),
I can star the engine.

This leads me to believe my problem is with the wiring harness:
specifically, the voltage regulator.

Does anyone have a suggestion for an economical replacement?

Regards

Richard

Reply to this Message

WayneC - 14 Nov 2003 23:34 GMT

> Hello
>
[quoted text clipped - 17 lines]
>
> Richard

I wouldn't be so quick to blame the voltage regulator. Even a courtesy
light left on will drain the battery (have a look around the car in the
dark); another possibility is a bad diode in the alternator (disco the
hot lead when the car will set awhile to see if it still goes dead).

If not one of those easy things, you should have an electrical shop look
at it before you start replacing stuff... they can measure current draw
and pull the circuit breakers one at a time to see if the drain is on a
protected circuit, and if not, check the alternator and other
non-protected sources.

Reply to this Message

Pamela and Chris - 16 Nov 2003 16:26 GMT

There is a simple test you can perform in order to verify whether or not
you have a drain on your battery when everything is shut off or if your
battery has gone bad. Disconect the negative terminal from your battery and
hook up a 12volt light between the post and the terminal. make sure
everything is off as if you were parking the car for the night. If the 12v
light is on you have a drain if not then you have a bad battery. If the
light is on start removing fuses one at a time to determine which circuit is
affected . Make sure you tape the door switch so the interior lights do not
come on and remove the bulb from the under hood light if so equipped.

Chris
87vdp

> > Hello
> >
[quoted text clipped - 28 lines]
> protected circuit, and if not, check the alternator and other
> non-protected sources.

Reply to this Message