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  1. Replaced both batteries

    Ask yourself one question, did anyone have these battery issues prior to Stop/Start and smart charging, if the answer is no, you have found your problem, the fix is to disconnect the negative rail sensor on the starter battery. With the sensor disconnected the EMU can`t read the SOC of the...
  2. 2018 Rubicon Recon -Just won't start

    Some Bmw`s had no start problems on earlier years, turned out it was the negative battery sensor on starter battery malfunctioning, some disconnected it and cars started, some replaced it, some left it disconnected...
  3. Super simple way to disable stop-start

    No I have a Merc and it leaves the Stop/start symbol on the dash crossed through, on my SLK the symbol goes out, that's it, as far as hidden fault codes, so what, they are only codes informing the owner that the sensor has failed, they are not important otherwise an ECM would be displayed. The...
  4. Auto stop start (ESS) permanent disable / defeat by unplugging hood sensor

    Hi guys, To get rid of stop/start I removed the negative rail sensor on my Petrol CGI 2012 Merc C-Class 6 months ago, (system is similar to yours I believe) with no issues or EML on dash. If the EMU can`t read the data from the sensor it does not know the SOC of the battery and (1) will not...
  5. Super simple way to disable stop-start

    Disconnect negative rail battery sensor on starter battery, no warning lights, no stop/start and a fully charged battery at all times, win win.
  6. 2018 Rubicon Recon -Just won't start

    It may be the ECU controlled smart alternator, ( the dealer charged the battery )the CPU will not allow the alternator to charge battery beyond 80% via engine, the other 20% has to come from any regeneration, to test this and get your battery fully charged disconnect the small sensor attached to...
  7. JL JUMPSTART

    I Came across this thread and thought this may help, my car is a Merc so could be different from Wrangler. On the Merc the small aux battery is for stop/start only, everything else is driven by the main starter battery, I believe your battery problems are caused by the computer controlled smart...
  8. JLUR Dead Battery (Update-Im told bad alternator)

    New ↑subiescott77 said: As another update a week or whatever later... I'm confident this problem will reoccur. My JLUR sat outside for 24 hours in 20deg weather, which is not an odd occurring thing. This happens every third day. After getting the new alternator, things functioned as they...
  9. Audio cutting in and out

    Trailhead Girl said, My batteries (there are two) have already been checked and they are fine. Nonetheless, we replaced the auxiliary battery just to make sure. To no avail, audio and back up camera problems persist. Rear defrost is a known issue. It's not a power issue, the connection itself...
  10. Audio cutting in and out

    Hi Guys, Did you know modern vehicles with stop/start also have a smart alternator controlled by the EMU via the negative rail battery sensor, the SOC of the battery is kept near to 80% to allow any regeneration, car overrun etc, the EMU also shuts off devices such as heated seats, audio...


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