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    Thread: 79 Diesel L electrical help

    1. 05-04-2012 10:47 PM #1
      I picked up a 79 Diesel L, had been sitting since approx 1996, I have got it running and all my lights working properly (and fixed the ghetto headlight wire job).

      It has Factory air and the optional 5sp
      Yes I have a Bentley's more than one for MK1 and several other manuals also

      Now I am trying to sort out the following;
      cabin blower fan not working (this is the type with 3 levers for the stacked on top of each other)
      Temp Gauge not working
      Fuel gauge not working (tank is full to the gills as I picked it up)
      Washer pump (works when hot wired)
      Radiator Fan (works intermittently when cold is selected but otherwise not)

      I am not great with electrical, just very basic stuff

    2. Member Bowcaster's Avatar
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      05-05-2012 03:04 AM #2
      Quote Originally Posted by mnaussie View Post
      I picked up a 79 Diesel L, had been sitting since approx 1996, I have got it running and all my lights working properly (and fixed the ghetto headlight wire job).

      It has Factory air and the optional 5sp
      Yes I have a Bentley's more than one for MK1 and several other manuals also

      Now I am trying to sort out the following;
      cabin blower fan not working (this is the type with 3 levers for the stacked on top of each other)
      Temp Gauge not working
      Fuel gauge not working (tank is full to the gills as I picked it up)
      Washer pump (works when hot wired)
      Radiator Fan (works intermittently when cold is selected but otherwise not)

      I am not great with electrical, just very basic stuff
      Start with new relays and a can of electric cleaner. Gooooood luck.

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      05-05-2012 03:08 AM #3
      Exactly start cleaning the wires. After this use a voltmeter to check if there is juice coming.

      This could be a relais, wire or fusebox issue.

    4. Member rabbitnothopper's Avatar
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      05-06-2012 05:41 AM #4
      fuel level sender inside pump probally rotted, remove seat,remove cap, pull level sender
      you can check it for ohms before pulling it out
      if you have a simple 2 pin then:
      27-33ohms is full
      233-270ohms is empty (varies)
      anything over 300ohms is bad, need to clean it
      REPLACE THE BIG O RING!!!

      other reasons:
      the voltage stabilizer on the cluster needs to be replaced or tested
      it controls several items in the dash
      it has 3 "feet/legs" and its an IntegratedCircuit (IC) you will know it....

      relay
      check your X relay (aka load relay)
      if your defroster unit doesnt work (12v) then that is most likely the issue
      it controls wiper, blower, defroster, etc (all the heavy amp items)

      if your radiator fan only works when "cool" is selected on the AC then you need to check the switch on the radiator
      there is a bypass relay here which is designed to do this, its a feature of AC cars
      the switch is located at the lower driver side under the battery at the bottom
      dont pull the switch out, just check it
      jumper the two wires together and the fan should come on no matter what (car off)
      if they dont then you have a problem
      then you can test the OHMS resistance of the switch itself as it heats up
      start when cold, check ohms
      start car, watch if ohms drop as the radiator temp warms up


      ok, washer pump
      id start by checking the wires on the column
      the bentley has troubleshooting information for this
      find it, it will help you
      otherwise as you have most of it apart checking it
      verify the contact on the pull lever is actually making a contact it may be dirty or bent
      you cant really see it unless you remove the steering wheel etc and have the switch in your hand


      let us know what worked, what didnt, if you have more questions
      and post pictures, we luvv pictures.........

      thanks

    5. 05-06-2012 10:41 AM #5
      Checked the sending unit last night I need to check again today (I think I got 33ohm)

      I will take some pictures and try to get them posted, I have a feeling I am missing the load relay? The relays on the fuse box are the following
      Glow plug
      left side flasher
      right side flasher
      321919505

      AC Fan Relay 171959143A on the steering column
      Relay for the radiator fan 321919505 also on the steering column

      The wipers work (both speeds) and when I pull the lever for the washer the seat belt/brake warning lights light up?

      The radiator fan kicks in when you bridge the thermo switch on the radiator

      That's about where I am at right now, I have the steering wheel pulled so I will check the washer switch on the column today.

      Thanks for the tips and advice so far

    6. 05-06-2012 10:31 PM #6
      Ok so I now have the washer pump working, but the seatbelt/brake light light up on the dash

      I have power at the rear defrost switch
      Radiator fan works when you jump the sensor in the radiator under the battery
      Radiator fan kick in at different speeds when the wires are jump on the relay for the AC

      Still no cabin fan, and I have not run the car today to warm it up and check resistance on the thermo switch.

    7. Member rabbitnothopper's Avatar
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      05-06-2012 10:54 PM #7
      good news is that you tested the wires on the thermo switch and the wires work
      therefore your switch is probally bad and needs replacement

      you should go stock and match it to your thermostat in the waterpump
      or just replace it exactly to the same temp stamped on the switch

      AC radiator fans have high and low speed (3 pin connectors)

      i am not sure why your blower does not work, more digging should illuminate this

      the seatbelt light is troublesome, mine will generally illuminate doing wierd things no matter what
      ignore it at all costs unless you must fix it
      i blame it mostly on the strange wiring of VW

      my 81 the seatbelt light flicks on every time the rad fan kicks on or off (relay related) it is only on for a split second
      ignore it
      my 78 similar situation, the light works normally (it goes off) but it will remain on and slowly slowly slowly fade away after shutting the car off
      ignore it....

      find the manual page for the relays & fuses in your bentley to check the fusebox

      i believe socket K is the load reduction relay
      you can test this relay by removing it and shorting pin 85 to 86 if it clicks then it works
      if no click then it does not work
      since your wipers and your rear defrost unit work (via the switch) then your load relay works

    8. Member rabbitnothopper's Avatar
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      05-06-2012 11:15 PM #8
      found this for you

      this item usually controls a few items on the dash


    9. 05-08-2012 12:41 AM #9
      Will check that one tomorrow thanks

      I go the heater / AC fan sorted, Dam Mice eat through the power at the bottom of the resistor bus next to the motor! Soldered a new wire in and all seems good

      I did check and I am getting power to the instrument panel so it might be the voltage stabilizer I will check it tomorrow.

      I am getting there slowly
      Thanks Guys

    10. 05-08-2012 09:00 PM #10
      It ended up been the voltage reg, I just swapped one from another cluster I had and Bam!

      Thanks for the help guys

      I only have the thermo switch to swap out and replace my windshield and should have this little rabbit on the road

      Now time for a few of these

    11. Member rabbitnothopper's Avatar
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      05-10-2012 12:02 AM #11
      Quote Originally Posted by mnaussie View Post
      It ended up been the voltage reg, I just swapped one from another cluster I had and Bam!

      Thanks for the help guys

      I only have the thermo switch to swap out and replace my windshield and should have this little rabbit on the road

      Now time for a few of these

      right on, glad you got it running

      troubleshooting and diagnosis helps save the day again

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      05-10-2012 11:36 AM #12
      Quote Originally Posted by mnaussie View Post
      Will check that one tomorrow thanks

      I go the heater / AC fan sorted, Dam Mice eat through the power at the bottom of the resistor bus next to the motor! Soldered a new wire in and all seems good

      I did check and I am getting power to the instrument panel so it might be the voltage stabilizer I will check it tomorrow.

      I am getting there slowly
      Thanks Guys
      If the heater fan hasn't melted pin 19 of the blue plug yet,..
      you should relay it on high.
      I just put the relay next to the fan in the rain tray and ran fuse/wire from the battery.

    13. Member rabbitnothopper's Avatar
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      05-15-2012 06:27 PM #13
      Quote Originally Posted by fatmobile View Post
      If the heater fan hasn't melted pin 19 of the blue plug yet,..
      you should relay it on high.
      I just put the relay next to the fan in the rain tray and ran fuse/wire from the battery.

      good tip, that is about 20-30 amps flowing through that one wire from the switch

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