My slk won't crank at all.
The backstory is that the first time it happened was back in 2009,
I took out the overload protection relay, as suggested on this site.
It was indeed a case of ruined soldering, and was resoldered by a professional electrician.
The car then drove without fault for 4 years and then
about a month ago I get in to start and,,, nothing, not even a crank. So I took out the relay module again and gave it a serious staredown for about 5 minutes, put it back in and the car started right back up.
then a couple of days later it happened again, so i took out the relay for the third time and noticed that the connectors on the module itself looked a little burned. So I gave them a little clean and the car did start, however a bit sluggishly though.
Then a couple of days later it happened again, so I took the relay out for the fourth time, stared at it furiously for some minutes, put it back in and turned the key.
Now is when it gets weird, I turned the key and after about a 2 second delay (normally it just immediately when the key is turned). I get one solid crank but nothing more, so i turn it again and after about a 2 second delay again i get one solid crank. Third time, nothing.
What is your take on this?
I've had the relay inspected by an electrician and he says it looks like new.
The search is not useful at all, there are about a million of these threads but only a handful of them actually get resolved.
Now before Jeff gets in here suggesting that it is the battery
as in several of other threads. I've tried jump starting the car but to no avail. If the battery were bad it should be able to be jump started without problems?
It measures 12.05V between the terminals and the same from + to the engine
,however the voltage drops down to about 11.95V after some start attempts.
The lights don't dim at all when the key is turned, suggesting the fault is electrical or is that only when the car actually cranks?