Help needed asap

[Farmer680 Lurker Find all posts View Profile Close Farmer680]

Hi I have a 2004 Toyota prado 120 series diesel I went to start it today when I turn the key it’s dead no noise at all it will push start no worries I have all dash symbols light up but no dash lights or power windows I tested the main battery it had under 12 volts and the battery on drivers side had about 9 volts I’ve tried jump starting with jumper leafs but nothing could it be alternator or starter motor or fuse what do I look for please

[404pug Avid PP Poster! Find all posts View Profile Close 404pug]

Started by assuming dead main battery and or dud alternator

[Farmer680 Lurker Find all posts View Profile Close Farmer680]

Hi thank you I bump started the car put a volt meter on the battery terminals when the prado was revved it went up 1 volt I put another good battery in on the drivers side then jumper leads on the passenger side battery when I turn the key nothing it’s dead

[ptommo59 Senior Member Find all posts View Profile Close ptommo59]

Try these steps and see if it starts between each step.

• Put your good battery in the main battery holder and connect up but remove the links to the secondary battery and any extra accessories.
• Check the following fuses in the engine bay fuse box - 30A marked AM2, 7.5A marked STA and replace if blown.
• Check the Relay in the engine bay fuse box marked STA Relay (see if it clicks when the key is turned to start)
  • if yes you most likely have a faulty starter motor.
  • If no, check if you are getting 12V on the STA Relay pin 3 (relay +) and pin 2 (coil +) when the key is in the start position.
    • If yes replace the relay
    • If no 12V on pin 2 then it could be your Park Neutral Start switch open circuit.
    • If no 12V on pin 3 then you could have a faulty ignition switch.

Probably more things to check but I hope that gets you started.

[Farmer680 Lurker Find all posts View Profile Close Farmer680]

Hi thank you very much, much appreciated

[ptommo59 Senior Member Find all posts View Profile Close ptommo59]

Should have mentioned that if your 30A AM2 Fuse was blown you could have a short circuit in your starter solenoid or wiring to it so it will most likely blow again.

[Farmer680 Lurker Find all posts View Profile Close Farmer680]

Hi the main 120 amp alt fuse is blown it has the clear top but iam having trouble getting the fuse box up it must have a few clips holding it in

[ptommo59 Senior Member Find all posts View Profile Close ptommo59]

If that fuse is blown did you connect the battery or jumper leads in reverse at any stage? (As this is a common cause and what that fuse is designed to protect the alternator from).

If not you have a short to ground or failed diode in the alternator so don't replace fuse and reconnect battery until you check with a multimeter.

There a few videos on youtube on replacing that fuse on various Toyota models which may at least give you some tips on how to dismantle the fuse box.

[JohnCW Lurker Find all posts View Profile Close JohnCW]

With any starting or charging problem start with know good fully charged batteries in the vehicle. A quality battery charger, one with a 'repair' function is relatively inexpensive and will get used again in the future.
It's unproductive to go looking for other problems till this fundamental is estimated.