Indicators not working

Discussion in 'Mech Tech' started by bump3r, Aug 12, 2020.

  1. 77 Westy

    77 Westy Supporter

    As it should be, hazards and indicators use the same clear single filament bulb.
     
  2. Its possible mine is US spec but I have one live/ one neutral wire with the earth being made through the screws into the body that hold the light fixing in place the low power element front powers the hazard the higher power element powers the indicators, on the rear the there is a single element bulb with two red lights on the rear side of the bus, i believe it to US spec as fitted with over riders on bumpers and a cow catcher on the side to add extra ventilation

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  3. That no 11 sometimes 12 fuse if it's something like stock ... green wire heading off from it, watch the old connectors they get quite brittle over time and snap when you nip them up... or they do if you're heavy handed like me

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  4. Well...there isn't a live and neutral (and a separate earth). It's not the mains ;).

    If you've got two wires going into the bulbholder, with the bulbholder grounded by the mounting screw, does imply you've got a US-spec holder that possibly has been bodged at some point. The two separate wires were likely a supply to the indicator filament, and a supply for the lower-powered front marker.

    Even US-spec busses use the same filament for indicating/hazards.

    How many contacts are there in the bulbholder?
     
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  5. Coda

    Coda Supporter

    What does your decoded mplate tell you about where your bus went after it was built? Is it an EU spec lhd or a US spec lhd?
    Either way, wiring diagrams are on the samba.
     
  6. Cheese straws and ice-cream sandwiches are on Itinerant Aircooled :thumbsup:
     
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  7. Coda

    Coda Supporter

    I know it was a joke but there is a thing in the Highway Code to indicate the opposite direction with hand signals. I think it’s wave up and down but if you do that with an oncoming T5 they’ll probably give you the bird. :D
     
  8. M code says it was built in Aug 70 released Jan 71 bound for New York , wiring probably has been 'modified' at a some time but the original advice of check contacts/voltages of bulbs still stands. :)

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  9. Coda

    Coda Supporter

    I don’t think I’ve been around long enough to get that.
     
  10. Coda

    Coda Supporter

    Yeah it would have needed to have a mod done to the indicators at least.
     
  11. All I can say is she's a fine bus with pretty much all her original fitments and the rarity of a factory fit sunroof which I'm in mid restore. Every bus is a thing of mixed joy and frustration to its owner

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  12. Up and down is breaking.. circulation motion is indicating to turn left.. .. and the sandwich reference is due to Mr Itinerants issues with gas station 'shopping' I believe..

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  13. You really don’t want to know :eek:
     
  14. They've been working fine with the one element for the past 9yrs so I don't think it's that
    Thanks everyone for the advice, I'll let you know how I get on tomorrow
     
    Deefer66 likes this.
  15. DubCat

    DubCat Sponsor

    Have you checked if the indicator switch is working. I had identical symptoms to you and it was the switch.
     
  16. mikedjames

    mikedjames Supporter

    Also check the hazard switch itself. It has a habit of disintegrating, if you are lucky a push together and a cable tie fixes that.
    The power for hazards is unswitched battery, the power for indicators is fused, the power source for the indicators is selected by wiring that goes through the hazard switch.

    So the indicator wiring, connector by the steering column for the switch, the fuse ad the indicator and hazard switch can all cause this symptom.
    If you poked around under the dash recently it might just be you knocked the connector by the steering column.

    Also I am sure the earth on my UK spec front indicators is a separate wire, but the bulb is single filament. The metalwork in the indicator unit is screwed into plastic, so theres an earth wire on the air box.
     
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  17. How do I check the switch. Cheers
     
  18. DubCat

    DubCat Sponsor

    The easiest way is probably to put your voltmeter across the live wire at one of the indicators and earth whilst operating the switch.
     
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  19. mikedjames

    mikedjames Supporter

    Get yourself a 12 volt test light or a meter.

    The hazard switch selects the power source for the relay (left hand section of E3 ) and then if hazards are selected, it shorts out the indicator switch and feeds all the indicator lamps (right hand section of E3 in diagram below)

    Using the wiring diagram, check for the 12 volt permanent feed on the switch 30 , and the second fused ignition switched feed 15 going into the switch. Check there is 12 volts on 49 with the ignition on and the hazard switch either in or out, as the first part of the hazard switch just selects where the power to the relay comes from.

    Then check that the wire from the hazard switch 49a has 12 volts (or pulsing with the hazards) . Turn off the hazards, leave ignition on.
    12 volts should remain on 49a.

    There is a connector under the dash upstream of E2 the indicator switch. Check for the same voltage as 49a on the centre connection of the indicator switch.
    Then check that both the left or right output of the indicator switch have 12 volts on them if you select that direction.


    Then check tjh Annotation 2020-08-13 114613.jpg
     
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  20. DubCat

    DubCat Sponsor

    Or yeah, you could do it that way :D
    .........if you understood it
     
    Deefer66 likes this.

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