Curly. The ring gear pickup L3 sits between pin 20- ws and pin 3- br/ge of N39 the EDS control unit. The output from pin 25 gn/sw goes to the test skt X29/4 then to N6 (Klima) pin 2 gn/sw and via X26 gn/ge to the instrument cluster A1 P7 marked TD (no pin number indicated). Confused yet. Fred.
________________________________________ From: Mercedes <mercedes-boun...@okiebenz.com> on behalf of Curly McLain via Mercedes <mercedes@okiebenz.com> Sent: 07 January 2016 22:37 To: Mercedes Discussion List Cc: Curly McLain Subject: Re: [MBZ] 124 tachometers I pulled the plug from the EDS computer. I found the tach signal voltage in the plug to the computer, but I have no signal out of the computer. According to the ETM, the output is pin 25, but I see no pin for input. There is no ID of pins in the computer or in the plug. Has anyone seen any pinout for the ESD Computer? I could run a jumper to the tach from the plug to check the tach, I suppose. or swap out the EDS Computer or dig into the harness and find the white/ in and the black/red out and jump them. Next: to get a speedo cable.... Then I'll figure out which option. Since the EDS is disconnected, I'm thinking just jump the tach in to the tach out. Anyone have a spare speedometer cable or a drivers seat adjustment switch? >Curly. >As before, the only place that I lost the tach signal was from a >broken ground wire at the battery ground lug. >Under the bolt were 3 or 4 thin ground wires, all broken on mine. >repair of the wires restored the tach to normal. >The ground wire is after the connector near the battery. >I have a spare EDS box that you could try. >YMMV. Fred >300TDt 1987 x2 > >________________________________________ >From: Mercedes <mercedes-boun...@okiebenz.com> on behalf of Curly >McLain via Mercedes <mercedes@okiebenz.com> >Sent: 07 January 2016 20:39 >To: Mercedes Discussion List >Cc: Curly McLain >Subject: Re: [MBZ] 124 tachometers > >Got back to checking tach and speedo taday. Pulled the head, cable >no turney, so looks like I need a new cable. Tach has no signal at >the head, but did have a signal behind the battery. so, it appears >like either there is no signal coming out of the EDS computer or the >wire from the EDS computer to the head is lacking continuity. > >According to 136 in the 124 ETM, at the output of the EDS computer, >there are 2 wires. One runs to the tach, one to the Klima (now >called in the book "A/C compressor control relay") Both wires are >green/yellow. > >So it appears that if i find a signal at the klima relay, then the >other wire is broken. If there is no signal at the klima, then >likely the EDS Comp is bad. (or the wire from the EDS comp to the >Klima is broken (not likely) > >Does anyone have any experience with either? Thanks > >87 300D >_______________________________________ >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 _______________________________________ 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 _______________________________________ 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
