Elelctrics Have Just Gone Down Right Before Mot Help!

[Dufus]

Hi,

Just had all the electrics on my 94 Celica go down. It ran through the test sequence once before turning off. Now nothing when you turn the key. Have checked fuses and they all seem fine (unless I missed some) The only thing I have done recently is replace the Battery.

There is a strange ticking sound sometimes (like a realay working) when you sit in and all doors are closed comming from the drivers side, which stops for a moment when you press on the horn or pedal, but other than that I am a bit stuck how to reset the problem. Anyone have any clues?

Thanks

[sotal]

Could be that the Battery has dropped down past a high enough charge level? Have you tested the Battery? You could try jump starting to see if the electrics come on. - I know you replaced the Battery but it could have been duff?

Other than that check all the fuses in the car and under the bonnet:

Fuse Box - Fascia 1:

Fuse Box Fascia 1 Legend:

F1 Instrument panel lamps

F2 Alternator warning lamp, alternator

F3 Tail lamps, fog lamps, rear fog lamps, licence plate lamps, headlamp beam adjustment

F4 Stop lamps, injection system, ABS

F5 Windscreen wipers, windscreen washers, rear screen wiper, rear screen washer

F6 Air conditioning system, heated rear window

F7 ABS control module

F8 Fog lamps, rear fog lamps

F9 Door mirror heater, injection system

F10 Instrument gauges, central locking

F11 Seat heater

F12 Cigarette lighter, clock display, audio system, door mirror adjustment

F13 Indicators, hazard lamps

F14 Starter motor, injection system

F15 Ignition system

F16 Central locking system, convertible roof

F17 Heated rear window, door mirror heaters

F18 Electric windows, sunroof

1 Ignition main circuits relay I

2 Tail lamps relay

3 Heated rear window relay

4 Combination control module/relay

Fuse box - Engine Bay 1

Fuse box Engine Bay 1 Legend:

F1 Starter motor

F2 Hazard lamps

F3 Horns

F4 Bridge link to F5, F6 & F7

F5 Audio system

F6 ABS control module

F7 Interior lamps, load area lamp, clock

F8 Headlamp - left

F9 Headlamp - right

F10 Spare

F11 Spare

F12 Engine coolant blower motor

F13 Air conditioning condenser blower motor

F14 Air conditioning system

F15 Main circuits supply

F16 Main circuits supply

F17 ABS

F18 Alternator charging system

F19 Airbag

F20 Injection system

1 Engine coolant blower motor relay I

2 Air conditioning condenser blower motor relay

3 Horn relay

4 Headlamp relay

5 Starter motor relay

6 Engine control module relay

taken from:

http://toyotaownersclub.com/forums/index.php?showtopic=26524

[Dufus]

Hi,

Thanks for that. No the Battery is perfect, almost seems like its too strong and may have caused the problem. Have checked the fuses in both areas and all are fine. Not sure how to run through checks for this problem really. Nothing comes on at all, not even the door light. I can hear a relay ticking though at some times.

[sotal]

Have you checked the Battery with the Multimeter? Car stuff isnt too sensitive so you should be alright up to about 15 volts. The Alternator kicks out atleast 14 volts anyway.

I cant quite remember where it was but I seem to remember there being a relay as part of the regulator curcuit and normally if voltage drops below a certain level it wont flick over and therefore you get no power, but I cant remember exactly what it was for. So if your Battery is fine I can only guess that your relay has died, try to find the source of the clicking and examine the relay. You should be able to get a replacement relay for a couple of quid so it should be worth a try

[Dufus]

Hi

Thanks for that. Will really test the Battery tonight. The relay seems to be clicking from the drivers footwell which is hard to get to with the doors closed so that it does click. Will try and hunt it down after checking the Battery.

cheers

[Dufus]

thanks for the help. Double checked th Battery and looks like the positive connection had worked loose! so intermitant power comming on and off. Tightened it up and all seems ok. Heres hoping