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  1. #1
    casual poster davad73's Avatar
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    Default Wb ute heater blower wiring power supply

    I have just removed the factory AC from my WB ute and put it back to standard like it used to be. The wiring was all still in place but the power feed wire that goes to the fan blower switch is only seeing 2V when the accessories are on. It does sense the accessories switch turning on/off.

    I have a HZ manual with a wiring diagram but it seems the WB series must be slightly different. (HZ diagram shows it comes from fuse panel number 13, WB does not have a fuse in this part of panel). Measuring continuity from fan switch wire back to the fuse box and there is nothing across all wires. Does someone have a WB wiring diagram and let me know where this wire power supply comes from?

  2. #2
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    MENTL6_WIRING.jpg

    I think this is not much helpful for you. I suggest you to visit an auto electrician for better service

  3. #3
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    With the AC disconnected, what is the power voltage at the AC switch?

    Sounds like you may have a bad connection along the line.

  4. #4
    casual poster davad73's Avatar
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    Thanks for the replies. It will be something so simple. I do have most of the dash out at the moment so it's easy to assess everything. I'll have some time to spend on it next week. I can always run a new wire straight to switch which I did to prove everything else works fine. I really want to find out what's going on. The old man has a WB manual with the wiring diagrams in it, just have to wait till he's back from holidays in 8 weeks. Pity he lives 400km away....

  5. #5
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    Do you still have the a/c harness or switch panel in the car? The blower fan is initially switched by the air direct lever then the speed is controlled by the blower fan switch. If you haven't changed the wiring/switch then you won't get power.

  6. #6
    casual poster davad73's Avatar
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    Finally got a WB wiring diagram which is different to the H series Holden's. The power wire from the switch comes from a 'heater relay' which is located up near the steering column. The relay has a 16 amp fuse which was buggered. Fuse looks to have just broken. I'd never seen this type of relay before with a fuse mounted on top of it. Looked up under the old mans WB and it has the same type of relay. I shorted the wire briefly and the fan worked perfectly. So will get another relay after the long weekend.

  7. #7
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    Hella Australia Onlne Catalogue Does the relay look anything like this?

    holden used a high fan speed relay in factory a/c systems that supplies battery voltage across the fan motor.the relay is switched by the blower fan switch but the relay is fused separately to the lower speeds. In the earlier (hq) holdens the relay was a round "tin box" style of relay. Mounted in the enjine bay In the hz holdens they used an "aftermarket" integrated system made by Air International. The vehicles that had these systems had the back of the glove box cut away and another plastic plate attached reducing the size of the glve box. The relay you mentioned sounds like the 1 in the link in that it has its own fuse.

  8. #8
    casual poster davad73's Avatar
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    Yes that's the same type of relay. The one removed was older type with a ceramic fuse mounted at the top of the relay under a plastic cover. Found the ceramic 16A fuse at the local autopro so old relay back in and fan working perfectly.

    Note: the wiring of the fan supply on my WB is the original from the pre AC days that was left in there just disconnected. Looking in the old mans WB it also has the same relay/fuse setup. Looking at the electrical diagrams on the HZ series the fan supply power was straight from the fuse panel whereis the WB drawings show the power coming from the fuse panel to the heater relay then to the heater blower switch and then to the fan.

    I should upload the WB drawing as there is nothing out there on internet land which I could find. Plenty of the other models. Finally Dad was back from holidays and brought the WB manual over.

  9. #9
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    Glad you got it sorted.
    uploading the wiring diagrams would be great as a friend has an immaculate wb ute.

  10. #10
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    THANKYOU so much for this thread. I've been pulling apart and chasing wires for an hour now. Same thing, thought it was switch. Nope. Ran a Hotwire and all works fine. Read this thread and remembered seeing that odd fused relay. A wire had come off the back. Voila! Sorted. Awesome, no more foggy windows

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