cars get pre-fuse boxes with fusible links than can pop if something nasty happened
I forgot to mention Starter was replaced about a couple months before I bought the car in a April so around December 2023 I seen the receipt and it was brought in because the car wouldn’t start… there was a warranty but not transferable. I do drive a lot I will check for starter I have been busy… but my question is the 9v was read by the fuses on the battery side… would a starter drop the voltages… thanks everyone for your responses
cars get pre-fuse boxes with fusible links than can pop if something nasty happened
I forgot to mention Starter was replaced about a couple months before I bought the car in a April so around December 2023 I seen the receipt and it was brought in because the car wouldn’t start… there was a warranty but not transferable. I do drive a lot I will check for starter I have been busy… but my question is the 9v was read by the fuses on the battery side… would a starter drop the voltages… thanks everyone for your responses
but my question is the 9v was read by the fuses on the battery side… would a starter drop the voltages… thanks everyone for your responses
there is a link between the front and rear batteries.... using that box of tricks - maybe whatever he was measuring was related to the weak rear battery - regardless of cranking or not the car will not behave correctly without a good rear battery
9V? Nothing on the car runs on 9V. Dude just buy a new battery. You bought a Mercedes. Cough up the money for new batteries. Or trade it for a Camry. Why all the fuss after you see 9V?
9V? Nothing on the car runs on 9V. Dude just buy a new battery. You bought a Mercedes. Cough up the money for new batteries. Or trade it for a Camry. Why all the fuss after you see 9V?
the cars had a cross over from two batteries, to a large battery up front - the twin battery ones have a small in the front - and a very large one hidden at the back of the trunk, accessed ONLY via the trunk after removing the trim - its behind the right rear seat)
the photo you gave in the first post would indicate you have the twin battery set up - and the front battery is a small 350cca one just to crank the engine - in the trunk is a massive one that does all the rest of the cars electrics
the idea is the back can help the front but not the other way around - as no one sees it - the rear one is often in a right mess - not that I believe it should stop the car starting if a good one is in the front - a naff rear battery certainly makes the car have a hissy fit - and as so much of the car relies on healthy volts from the one in the back - and you are getting nowhere - it might be worth fitting one at the back - it should be an AGM battery
it would be sensible to have the front disconnected and do not short out any electrical kit in the trunk - its a right faff of a job slide it on a bit of plastic - like a bag - and disconnect / reconnect the breather pipe elbow on the right side (can be done with battery in place - but not much room
I finally got around to the trunk battery got it tested and it had 0% health replaced it with the amg battery.. let me tell you in this Vegas heat that was a work out the sucker is big and heavy… however I still get no crank no start smh
there are lots of people seemingly having this situation
you can't just slap batteries on back to front, or short leads out on modern cars - they just eat money when doing this... with no way to know it this has driven the situation you are in, someone is going to have to start checking things - and don't assume like you see on youtube you can do all this with out a power supply because you have a new battery - a new battery on a w221 will last less than 30 mins with the key on before its too dead to operate correctly - (and that’s without cranking it even once)
peruse these and many others to give you a few ideas
thanks for all the information I forgot to update but it was the starter that went out and caused the no crank no start. It was replaced and car fired right up. Thanks so much for the knowledge. Now on to the next problem 😂
thanks for all the information I forgot to update but it was the starter that went out and caused the no crank no start. It was replaced and car fired right up. Thanks so much for the knowledge. Now on to the next problem 😂
Great!
Could have it fixed in July already by some instruction.
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
