Rich, our cars must have been plotting. This a.m. my wagon refused to start; no glow timer light. She'd been idling very rough during cold idle for the first 30 seconds or so over the last month, and so I was suspicious of the glow plugs. I'd tested resistance a couple weeks ago but all seemed OK. Tested again this a.m., all plugs tested fine and fuse looked good. Still no glow light, no start. Extended cranking of the engine wouldn't even get one cylinder to light off. Put the battery on the charger and took a closer look at the fuse, and sure enough it had a hair-line crack.
Check my spare fuses - 30 Amp only - darn! Used a piece of 14 gauge wire to jumper the fuse screws, and she started right up. Will be attempting to purchase two fuses locally after work today... I'm still trying to figure out the rough cold idle; I may have to rig the in-line ammeter and test the plugs that way. -Max -----Original Message----- From: mercedes-boun...@okiebenz.com [mailto:mercedes-boun...@okiebenz.com] On Behalf Of Rich Thomas Sent: Sunday, January 31, 2010 3:00 PM To: Mercedes Discussion List Subject: [MBZ] One bad glow plug spoils the whole bunch? The SD has been reluctant to start recently (in the "cold" weather we have here) so I just checked on it. Looks like the rearmost glowplug (#5?) is bad, I get open (OL) reading on the ohmmeter while the others are in the 0.6ohm range. The glow plug fuse and relay are OK, getting 12V across the fuse and at the relay pins until the relay clicks off. None of the glow plugs seem to be warming up though (according to my calibrated finger). Can that one bad glow plug cause the others not to heat up? I don't have a amp clamp, but if there is 12V at the plug wires at the relay it should be getting juice to all of them? I'll go out to make sure there is 12V at each plug connector to make sure the connector didn't go bad or something. That last plug looks like a bugger to get out too. --R _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com