Won’t start twice in last two days. Battery only at 10v

[Goblue710]

So have a OBX 2.7 got it in Feb 22 only 7500mi, live in Midwest so it’s getting cold…

So I go to start my Bronco Thursday night and lights go on, you hear the click but it doesn’t turn over. Using my mm I see it’s only at 10.2V. Using my neighbors booster, we get it started and I drive around for 30min. As I drive its holding 15V so I’m somewhat ruling out the alternator.

starts on Friday fine, run errands this morning, but at 4p it’s dead again. Dash goes on and it’s only showing 10.5V. Call the dealer and bringing it in Monday.

So my brain is running, battery bad?, short somewhere, something drawing voltage even when off? What’s the groups thought?! Thanks in advance for your feedback.


Side note: last week had an issue where the rear passenger side door window lost its program. So it wouldn’t do that courtesy .5” roll down when opening door. I reset the window (6g thread helped!) and it worked fine.

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[JBlanco]

I've read about many pointing to loose battery connection and/or junction box connection.

 

[prospectfour]

So have a OBX 2.7 got it in Feb 22 only 7500mi, live in Midwest so it’s getting cold…

So I go to start my Bronco Thursday night and lights go on, you hear the click but it doesn’t turn over. Using my mm I see it’s only at 10.2V. Using my neighbors booster, we get it started and I drive around for 30min. As I drive its holding 15V so I’m somewhat ruling out the alternator.

starts on Friday fine, run errands this morning, but at 4p it’s dead again. Dash goes on and it’s only showing 10.5V. Call the dealer and bringing it in Monday.

So my brain is running, battery bad?, short somewhere, something drawing voltage even when off? What’s the groups thought?! Thanks in advance for your feedback.


Side note: last week had an issue where the rear passenger side door window lost its program. So it wouldn’t do that courtesy .5” roll down when opening door. I reset the window (6g thread helped!) and it worked fine.

Same issue with my 2.7 OBX. Took delivery in April with 5k miles. Dealer replaced the battery but still find it dead some mornings. Mine is not a DD so I’m thinking it’s the short infrequent drives I do?

Some people have found it to be a bad gateway module and others have found loose connections. I’m going to drive mine more often and see if that’s the fix since the dealer ruled the other two out.

 

[Unconquered]

If it dips to around 10 volts and stays there that sounds like one of the battery cells is failing. If it keeps dropping below that it could be that the whole battery is shot, but more likely there's something staying on and draining the battery.

 

[da_jokker]

The dealer should have the ability to load test the battery and see if it is the issue. There have been some batteries that have been toasted because Ford allowed the Broncos to sit forever after being built (dirt mountain, chip holds, etc).

If you really wanted to know, charge the battery, make sure it registers 12.n volts, then take off the negative. Come back in the morning and test the volts. If its back down bad battery... If it isnt, something draining it.

 

[Theherofails]

I know of one member here who had a similar issue.. His issue ended up being a chewed through wiring harness under the vehicle. Squirrel or something gnawed on it and caused random no start issues for months..

 

[Goblue710]

Update: used a 1200amp battery pack I have for work to jump it. And started right up. But now the driver window lost its auto roll programming. Second window that happened to this week…module or something is going bad and/or causing increase draw…dropping in dealer lot today for them to check it tomorrow.

 

[Felix808]

If it dips to around 10 volts and stays there that sounds like one of the battery cells is failing. If it keeps dropping below that it could be that the whole battery is shot, but more likely there's something staying on and draining the battery.

This.

 

[swooshdave]

Update: used a 1200amp battery pack I have for work to jump it. And started right up. But now the driver window lost its auto roll programming. Second window that happened to this week…module or something is going bad and/or causing increase draw…dropping in dealer lot today for them to check it tomorrow.

That could just be a side effect of the bad battery. Hope you get it sorted out soon!

 

[Silver-Bolt]

If you primarily take short trips you are using more energy from the battery than you are replacing.

More likely, a bad battery or loose connections.

 

[Ford Motor Company]

So have a OBX 2.7 got it in Feb 22 only 7500mi, live in Midwest so it’s getting cold…

So I go to start my Bronco Thursday night and lights go on, you hear the click but it doesn’t turn over. Using my mm I see it’s only at 10.2V. Using my neighbors booster, we get it started and I drive around for 30min. As I drive its holding 15V so I’m somewhat ruling out the alternator.

starts on Friday fine, run errands this morning, but at 4p it’s dead again. Dash goes on and it’s only showing 10.5V. Call the dealer and bringing it in Monday.

So my brain is running, battery bad?, short somewhere, something drawing voltage even when off? What’s the groups thought?! Thanks in advance for your feedback.


Side note: last week had an issue where the rear passenger side door window lost its program. So it wouldn’t do that courtesy .5” roll down when opening door. I reset the window (6g thread helped!) and it worked fine.

Good morning. Would you send over a private message with your VIN and the name and location of your Ford dealer so I can look into this no start concern on my end? Thank you!

 

[swooshdave]

If you primarily take short trips you are using more energy from the battery than you are replacing.

More likely, a bad battery or loose connections.

I've seen more than one report of loose connections.

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