Hi all,

I recently replaced battery as part of a suspected alternator issue, however now I get absolutely no electrics when connecting.
Put my tester on battery beforehand and is fully charged, but once I connect it up to the car and put tester on again I get nothing. almost like the car is shorting it out.
Could it be a short? Fuse Gone? Did wonder if maybe it was the module on the negative battery cable, swapped that, no change.
I had an issue just before which I suspected was the alternator, whilst driving all main electrics went off, had lights and drive only, managed to get it home and would not start again after stopping.
Put in new battery to try and get it to garage, which is when the issue above started.
Have been without for nearly 2 weeks now trying different options

 

Hi
I suggest to get a voltmeter so you can actually measure the battery voltage. The tester's electronics are usually not designed to diagnose electrical issues in the car.

I assume you charged the new battery before placing it in the car? A charged battery should be in the range of 12.6-12.8V, depending on the load that is connected.

From what you describe the battery voltage drops significantly when connecting to the car. That would point to a short cut, possibly in the alternator circuit. To test I would suggest to disconnect the main lead to the alternator. That can be done either by disconnecting the cable directly on the alternator, or if you like it easier, just remove the 450A fuse in the trunk. That will disable starter and alternator circuit, but leave the rest of the car connected. If the voltage stays the same now your problem is either in the alternator (likely) or starter (less likely).



Good luck, and be careful when disconnecting and reconnecting batteries.



Chris