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Battery light on, alt tests fine off car, anyone know what this is?
Odd topic line, but here goes. 2007 G35 Journey. Battery light came on the other day and stayed on all the way home (39 miles). Checked alternator output and it showed 11.63vdc. Battery previously had shown 12.62vdc. Charged the battery and still have the light and low output. Removed the battery and alternator (alternator is 14 mos. old, battery ~18 months) and had both tested at a local NAPA. Both test good. While there I got a negative cable since mine wasn't as tight as it needed to be (yet was as tight as I could get it, perhaps it's the whole problem). Anyway, the old cable is routed through what looks like it might be a current detector (see the pic). I had to cut the old cable to get it out as neither connection end would go through and, of course, the new cable won't fit through either! Grrr…. So, what I need to know is does the negative cable have to be routed through this device? Tom
Yes the cable needs to go through that CT, should be Nissan part number 24080-JK60A Cable Assy - Battery Earth. Your local Nissan will have them in stock, it's an assembly with the wire and the CT together, they cost like $50 new.
Also, if your alternator is only putting out 11.5v then it probably needs to be replaced, should be 14.5vdc at operating rpm. Get the new negative cable installed first then use a digital multimeter to read voltage across the battery terminals, if it's not 14.5 (or very close to that) and the battery light is still on then your alternator is not working properly.
New ground installed. Alternator output is 14.5vdc and battery light is out. I went to the dealer and a mechanic confirmed that it is a current sensor. Parts looked it up and it doesn't show it under a 2007, but 2008 did. Their price is $106. An online dealer shows it for $47. Fortunately it doesn't look like I need it.
2007 was basically a split model year, the COUPE was the older V35 (VQ35DE engine) platform whereas the SEDAN was the newer V36 platform. Then in 2008 the COUPE got the VQ37VHR engine while the SEDAN kept the VQ35HR. It's confusing trying to find parts sometimes.
Your searches were probably showing the battery cable for the coupe.
2007 was basically a split model year, the COUPE was the older V35 (VQ35DE engine) platform whereas the SEDAN was the newer V36 platform. Then in 2008 the COUPE got the VQ37VHR engine while the SEDAN kept the VQ35HR. It's confusing trying to find parts sometimes.
Your searches were probably showing the battery cable for the coupe.
Actually, no. One, the site I use breaks it down by specific sub-model. You can also find parts by vin. The site is run by an Infiniti dealer. Second the part number was the same as I got from the local dealer. Anyway, hopefully the ground cable resolved the issue.
Reviving this thread. Update: took the car to two shops and it was fine when there. No problem found. Took it to a dealer and they said likely the current sensor. Replaced that today and on starting the car the battery light stayed on. The brake light stays on when this occurs as well. Even revving the engine would not get it to go out as has happened before. Put the original current sensor back in and battery light still on, but rev'ed the engine and out it went. It seems like it isn't always getting the excitation voltage so when I rev it the alternator self-excites and is fine afterwards.
Front and rear cameras, tire pressure for all four tires can display on screen,folding side view mir
Originally Posted by tjrob2000
Reviving this thread. Update: took the car to two shops and it was fine when there. No problem found. Took it to a dealer and they said likely the current sensor. Replaced that today and on starting the car the battery light stayed on. The brake light stays on when this occurs as well. Even revving the engine would not get it to go out as has happened before. Put the original current sensor back in and battery light still on, but rev'ed the engine and out it went. It seems like it isn't always getting the excitation voltage so when I rev it the alternator self-excites and is fine afterwards.
So, something I've noticed recently is when starting the battery light either stays on or it flashes. When it flashes it then goes out once running. When not flashing it stays on. Not sure if this is indicative of anything or not. I don't recall the charging description saying anything about this.
