ok new battery fitted Still slow cranking The last lead to replace is battery to starter Any one know how long as will have one made Thanks in advance Peter
Start by cleaning the ends of your existing lead with e.g. 200 grit wet and dry. You could also try as a simple test, clipping a wire to the thread on the starter motor positive connection and then another to the metal of the battery post itself and try cranking while measuring the voltage between these points. Do the same from the negative battery post to the bodywork amd again from the engine block to the bodywork. All of these voltage drops should be much less than one volt. The biggest drop is due to the highest resistance connection and that will be the connection to check/clean and maybe replace. Use science rather than stabbing at the problem.. Also measure the battery voltage across the posts while cranking. It should be over 10 volts.. If not, thats the problem, even if its new its either flat or junk. Take another wire from the tag on the starter round so you can touch it to battery positive to get it to crank without needing a helper ( remote starter, useful bit of kit in the bus anyway)
As mentioned check the battery voltage when cranking. If it’s a good new battery you need to check the current draw of the starter with a DC amps clamp. It could be the starter that’s faulty drawing excessive current.
Unfortunately new batteries do go wrong . I paid a fortune for the top of range ,five year guarantee battery form my diesel t5 . Worked great for five days then it gave the same symptom you describe . Thankfully swapped with no hassle at halfrauds .
