Picked up car from having transmission and transfer case ...

Picked up car from having transmission and transfer case replaced 2 days ago. Ran ok day I picked it up but wouldn’t start yesterday. It got cold overnight so tried jumping it but that didn’t work, battery was tested and it’s putt...

Picked up car from having transmission and transfer case replaced 2 days ago. Ran ok day I picked it up but wouldn’t start yesterday. It got cold overnight so tried jumping it but that didn’t work, battery was tested and it’s putting out 12v sitting and 11.8/9 when I go to start it. Lights all come on in the car and you can hear a click when you try to start it. Could my starter have gone out or is it related to the transmission job? Mechanic's Assistant: Where exactly do you think the noise is coming from? And how long has this been going on? No noise besides the starter click, happened yesterday Mechanic's Assistant: What is the make/model/year of your transmissions? 2007 BMW [X3](/topics-x3/) Mechanic's Assistant: Are you fixing your X3 yourself? What have you tried so far? No I took it to the shop trying to figure out starting issue myself Mechanic's Assistant: Anything else you want the Mechanic to know before I connect you? Can’t put the car in neutral or decompress [brake](/topics-brake/) but assuming that has to do with the no start issue

Automotive Expert
Hello, my name is \*\*\*\*\* \*\*\*\*\* I will be helping you with your question today. I've been working on BMWs for over 30 years now, so I should be able to help you through this. Please understand that some of my suggestions may require special diagnostic tools and equipment that many home mechanics may not have, but are often required. Actually, this one is pretty easy. If you're anything under 12.2v, even when it's cold, you're going to need a battery. BMW's built in the last 20 years won't even attempt to crank the starter if the battery isn't sound, and at 11.8-11.9 volts, you're likely only seeing maybe 200CCA, which isn't enough to turn the starter. Please let me know if I can offer any further information

Thanks! Why would a jump not work but the lights still come on? I tried jumping twice and it sat for about 20 min hooked up
Automotive Expert
Was that 11.9 figure with the jumper cables on or off? I was assuming with them on. Also, were you jumping right at the battery, or the jump posts under hood?

Off- used the posts under the hood
Automotive Expert
Ok, got that. So, 2 answers to this. 1) let's say that the battery is low enough, that even with cables on, the total amp capacity in the starting system is hovering around 300CCA then it won't start. 2) however, let's say that you've got plenty of voltage, then there are 3 possibilities here, that I can think of. - braided stainless ground strap between [engine](/topics-engine/) support bracket and subframe is corroded or broken (this should have been noticed during trans change if so) - one of the starter wires isn't properly connected from the recent trans swap - starter has gone bad (unrelated to recent work)

Ok, thanks. Would it hurt to try jumping it again?
Automotive Expert
No, not at all, but if you can reach, try to get the jumper cables directly on the battery in the hatch.

Got it, thanks!
Automotive Expert
very glad to help!

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