Curly. My '87 TD had an intermittent Tach which then died. It turned out to be the small ground wire(s), under the large main ground wire bolted to the shock mount, were broken off. On my TD the shock mount was coming adrift at the seams, thus fatigued the wires that eventually failed. YMMV. Fred
________________________________________ From: Mercedes <mercedes-boun...@okiebenz.com> on behalf of Curly McLain via Mercedes <mercedes@okiebenz.com> Sent: 02 December 2015 02:25 To: Mercedes Discussion List Cc: Curly McLain Subject: [MBZ] 124 tachometers I seem to have 2 124 Diesels ( 87 300D) with non working tachometers. I have a couple of spare Klimas, so I can try swapping them and the OVP relay to start. I did that on one of them before with no change. Also tried direct ground on the cluster with no effect. OVP relays, I have to swap from another car, but that is possible. Anyone BTDT? One idles real slow, then fast, then slow, etc without any apparent rhyme or reason. The other just idles too slow. I am pretty sure the idle speed and the tach are related some how. Where does the tach signal originate? The tach signal goes to the klima, then out, I believe. Possible self destructing insulation on the wire bundles? I thought 87 Diesels were prior to the problems. _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
