Comments on: How to start a Mercedes with dead key battery https://www.mercedesmedic.com/start-mercedes-dead-key-battery/ Mercedes-Benz Repair Guides, Service, How To DIY Wed, 15 Mar 2023 06:23:06 +0000 hourly 1 By: Henry Adams https://www.mercedesmedic.com/start-mercedes-dead-key-battery/#comment-40102 Sat, 09 Sep 2017 14:25:34 +0000 http://www.mercedesmedic.com/?p=8176#comment-40102 In reply to John.

I have a 2005 E 320 CDI With similar no crank issue. It is erratic works most of the time but seems worse in hot weather conditions. Removing the lid of front SAM fuse box and tapping starter and computer control relays whilst turning key has worked every time to start engine. Probably a ECU Issue will probably get worse over time. I’m hoping with cooler weather approaching problem will resolve until next summer. I have replaced both backup and starter batteries, new Bosch alternator voltage regulator and the two above mentioned relays with new MB dealer parts but problem still happens. Hot/cold intermittent electrical issues are common on older computer circuits. I can live with intermittent no crank until I can afford to replace ECU.

]]> By: John https://www.mercedesmedic.com/start-mercedes-dead-key-battery/#comment-36906 Wed, 19 Jul 2017 15:46:43 +0000 http://www.mercedesmedic.com/?p=8176#comment-36906 A member of my family has a MB C220CDi Classic SE which has developed a erratic starting problem, causing it to not start. The engine does not turn over yet all the panel lights are illuminated. It has a 5 month old battery purchased new. The ECU has been checked and found to be fault free. Apparently no fault codes are showing
and having been recovered twice from this non start mode. It does then fire up. The start relay has been changed as a precaution, having previously been starting, when on fitting the new start relay, it refused to start one more. Thinking it was possibly a faulty replacement, I refitted the original, and once again no start.
It has been recovered twice from a non start mode and then taken to two separate specialists who still have not located the problem. Has anyone got a possible solution to this kind of irritating problem.

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