3

thanks in advance!

I have a 2007 Nissan Murano SE. The primary symptom is it literally loses power while driving, going into emergency mode before finally dying all together. But no low battery indicator ever comes on.

I just got a new battery and AutoZone tested the alternator output and their tester device said the alternator is working fine.

I've thought about parasitic drain but not sure what parasitic drain would be so strong is to kill the battery while driving.

If I fully recharge the battery, the car seems to run fine for a day or two, but clearly the battery is not being recharged.

Again, my first thought is the alternator but the alternator output test says it's outputting fine. So if you have any ideas I'd appreciate it. Is there a fuse or relay between the batter and the alternator?

Thanks again.

Patrick Gallagher
  • 31
  • 1

1 Answers1

2

The 2007 Murano has a fusible link attached to the + battery terminal on the black-red wire that goes to the alternator's B terminal. A fusible link is just a heavy duty fuse.

If the fusible link has blown, your battery won't charge, but it will supply power to the car until it's exhausted.

To prove that it is bad before you replace it, turn off the engine, connect an ohmmeter between the battery + terminal and the alternator's B terminal, which has a red-black wire. The ohms should read 0 or nearly zero such as less than 1 ohm. If there is no reading (infinite ohms), the fusible link should be replaced.

It's never a good idea to let an alternator charge a nearly dead battery. Better to use a battery charger to at least partially charge the battery before letting the alternator finish.

MTA
  • 10,754
  • 1
  • 12
  • 38