Robert S-Max Posted February 20 Share Posted February 20 Hi I have a S-max 2010 2.0 tdci changed battery brand new nothing changed starter motor still nothing can bump start and jump start everything fine no warning lights leave it overnight go to start no start any help much appreciated as I have had this problem 2 days now Quote Link to comment Share on other sites More sharing options...
TomsFocus Posted February 20 Share Posted February 20 Have you checked the voltage of the new battery? If it'll jump start, it has to be a battery fault. Either the battery itself or the battery cables. 1 Quote Link to comment Share on other sites More sharing options...
unofix Posted February 20 Share Posted February 20 1 hour ago, Robert S-Max said: Hi I have a S-max 2010 2.0 tdci changed battery brand new nothing changed starter motor still nothing can bump start and jump start everything fine no warning lights leave it overnight go to start no start Funny I'm currently working on a Vauxhall Movano with the same fault. It's happy to be jump started, but even with a brand new battery fitted yesterday it won't start unless jumped. I'm just waiting delivery of new cable and I'm going to replace the cable to the starter motor. Quote Link to comment Share on other sites More sharing options...
Robert S-Max Posted February 20 Author Share Posted February 20 I was talking to a mechanic and he said it could be due to earth points The battery was tested got a new starter still the same the alternator is giving out the correct voltage but I connect battery to another vehicle like a jump start but not running my car will start I've looked online to find my car needs 1150 cca to start but my original battery has 780 cca Quote Link to comment Share on other sites More sharing options...
Robert S-Max Posted February 20 Author Share Posted February 20 Could it just be down to cca of battery? Quote Link to comment Share on other sites More sharing options...
Robert S-Max Posted February 21 Author Share Posted February 21 This is the link to the info I found about the cca for battery's https://fordbatteryfinder.com/best-battery-for-ford-s-max-wa6/ Quote Link to comment Share on other sites More sharing options...
TomsFocus Posted February 21 Share Posted February 21 10 hours ago, Robert S-Max said: This is the link to the info I found about the cca for battery's https://fordbatteryfinder.com/best-battery-for-ford-s-max-wa6/ I'm not sure that's correct. I can't remember seeing any car battery with over 1000CCA. A 2.0 TDCI shouldn't need any more CCA in an S-Max than it does in a Focus. Ford parts catalogue suggests a 2010 S-Max has batteries ranging from 500CCA to 700CCA. So 780CCA should be more than enough. battery cables should definitely be checked. My money is on the earth cable if you're connecting the donor battery to the chassis rather than the negative terminal. 1 Quote Link to comment Share on other sites More sharing options...
Robert S-Max Posted February 21 Author Share Posted February 21 I was talking to my friend who has a c-max exactly the same problem as mine his mechanic said it's something to do with a sensor out of alignment when that is sorted it should fire up I'm trying to find out what sensor and will update Quote Link to comment Share on other sites More sharing options...
Robert S-Max Posted February 21 Author Share Posted February 21 43 minutes ago, TomsFocus said: I'm not sure that's correct. I can't remember seeing any car battery with over 1000CCA. A 2.0 TDCI shouldn't need any more CCA in an S-Max than it does in a Focus. Ford parts catalogue suggests a 2010 S-Max has batteries ranging from 500CCA to 700CCA. So 780CCA should be more than enough. Battery cables should definitely be checked. My money is on the earth cable if you're connecting the donor battery to the chassis rather than the negative terminal. Yes I am connecting to chassis Quote Link to comment Share on other sites More sharing options...
unofix Posted February 21 Share Posted February 21 12 hours ago, Robert S-Max said: I've looked online to find my car needs 1150 cca to start That is not quite true. The instantaneous peak current that could be potentially reached is 1150A for a fraction of a second, before falling back to the actual cranking current, most probably less than 700A. 1 Quote Link to comment Share on other sites More sharing options...
Robert S-Max Posted February 21 Author Share Posted February 21 So do I need a battery capable of 1150 cca peak then Quote Link to comment Share on other sites More sharing options...
Robert S-Max Posted February 21 Author Share Posted February 21 2 minutes ago, Robert S-Max said: So do I need a battery capable of 1150 cca peak then And obviously clean and check all earth cables Quote Link to comment Share on other sites More sharing options...
unofix Posted February 21 Share Posted February 21 1 hour ago, Robert S-Max said: So do I need a battery capable of 1150 cca peak then No. A battery with an average CCA of 800 to 900A will be more than enough. It's not that big of an engine. Quote Link to comment Share on other sites More sharing options...
Robert S-Max Posted February 21 Author Share Posted February 21 Ok I'm going to try to clean connections and maybe replace wires for starter motor Quote Link to comment Share on other sites More sharing options...
Robert S-Max Posted February 22 Author Share Posted February 22 No joy still the same took off most earth points to wire brush made sure they were tight. The strange thing is no dash lights dim when trying to start tried all relays apart from the really big ones as the tester wouldn't accommodate them but if you put your finger on top of them you can feel them click when trying to start. Could it still be an aging battery if so then why wouldn't it start with new battery unless it was a dud one I bought. Quote Link to comment Share on other sites More sharing options...
Robert S-Max Posted February 22 Author Share Posted February 22 When it all started I noticed one of these without the top on it in the engine fuse box but when I looked found the top plastic bit and put it back on because It looked fine but I have bought a new one and replaced it also on the battery positive connection what is the plastic thing after the terminal also the plastic box on the engine wiring loom I will take photos tomorrow Quote Link to comment Share on other sites More sharing options...
Robert S-Max Posted February 24 Author Share Posted February 24 Quick update car is running as should and starting all it was a dodgy earth cables going to starter motor which has been replaced 1 Quote Link to comment Share on other sites More sharing options...
ComfySofa Posted February 27 Share Posted February 27 Just read through this - always nice to see a resolution. Ironically i was watching a Matt Armstrong YT vide a couple of weeks back - an RS6 that had the same problem...and it was almost the same thing... Quote Link to comment Share on other sites More sharing options...
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