Page 1 of 1
Eberspacer timer wiring?
Posted: Thu Mar 10, 2011 8:17 am
by wshawn
Having recently changed my dash for one that is uncracked complete with un-discoloured wood inserts I thought it was time to have a look why the Eber timer doesn't work and its' simply the fact the timer isn't connected to the switch.
On the rear of the clock there is a pair of spare terminals labelled 30 and B in a 3 o'clock position. I suspect one of these are the terminals to connect to the eber switch which also has a pair of empty places in the multiblock connector, again I assume these are for the timer to plug into.
Therefore if my assumptions are correct what connect to what? I obviously need to check the eber switch as well to see if there are actually contact beneath the spaces on the multiblock as I was pushed for time when I refitted the dash but I have some time tomorrow (if it stays dry) to see if the timer will work.
Re: Eberspacer timer wiring?
Posted: Thu Mar 10, 2011 4:16 pm
by david58
Re: Eberspacer timer wiring?
Posted: Fri Mar 11, 2011 1:57 am
by wshawn
Thanks for that wiring diagram but, if I'm reading correctly, it doesn't show how to connect the 24 hour timer that is part of the clock in the dash to the eber switch.
On the rear of my clock (24 hour timer) there was a short wire that had the correct terminal to fit into the multi block that plugs onto the rear of the eber switch but I'm not sure which one of the 2 possible positions in this multi block it would plug into and then what the other terminal on the rear of the timer would be for.
Does that make sense?
Re: Eberspacer timer wiring?
Posted: Fri Mar 11, 2011 3:58 am
by david58
http://www.ratwell.com/technical/Tachograph.html wrote:M557 Wiring:
OK, you've been lucky enough to find the gas heater timer clock on eBay but you have no idea how to hook it up. Send $5 in SASE to:
Gas Heater Timer Instructions
c/o Ich liebe Deutsch Fahrzeuge
9801 Metric Blvd.
Austin TX 78758
OK, enough with the joking. There are 4 contacts on the back of the gas heater timer clock + the "hole" for the instrument light:
* ground - unlabeled right tab (any brown ground wire will do)
* +12V - rearmost tab at back of clock gets power from emergency switch (just as plain jane clock would)
* B - left side, connects to terminal 30 on gas heater timer switch (power via fuse S9)
* 30 - left side, connects to terminal 4 on gas heater timer switch (bypasses accessory fuse S10)
Bosch terminal designations aside, this hookup is really quite simple: the clock timer acts as a bypass switch for the gas heater timer switch. When the clock timer is set the ignition key position (off) prevents the heater knob from activating the gas heater when you set the temperature. When the timer activates it powers the same terminal that the heater switch would if the ignition key was on.
http://www.ratwell.com/technical/Tachograph.html
Re: Eberspacer timer wiring?
Posted: Fri Mar 11, 2011 4:54 am
by wshawn
Thank you very much! That looks like the info I've been looking for.
Re: Eberspacer timer wiring?
Posted: Sat Mar 12, 2011 8:03 am
by wshawn
Just to let you know, the ratwell link was spot on and my timer now works as it should.
And this rounds of quite a productive week doing some of the little jobs I've not had time to do on the 412.
