[Mgs] Hazard blinkers at half speed

[Hans Duinhoven]

Another point to look at is the hazard and blinker circuit are connected 
centrally at the hazard circuit.
My USA spec 71 BGT sometimes does not want to blink or almost.
Then flicking the hazard switch on/off several times will clean the contacts 
again and it all works for some time.

This trick works for over 11 years now very well.

Cheers,

Hans

----- Original Message ----- 
From: "Paul Hunt" <paul.hunt1 at blueyonder.co.uk>
To: "davewillner" <dwillner at ptd.net>; <mgs at autox.team.net>
Sent: Monday, September 26, 2011 10:04 AM
Subject: Re: [Mgs] Hazard blinkers at half speed


> Two problems.
>
> The hazards use a different flasher unit to the turn signals, and should 
> work normally i.e. flash at the correct speed as long as there is at least 
> one connected bulb.  If any bulbs even light with the turn signals, but 
> nothing happens when you turn the hazards on, then you need to check the 
> hazard circuit from the in-line fuse (brown both sides) through the hazard 
> flasher to the hazard switch.  The switch when on connects four terminals 
> together - light-green/brown from the flasher unit, green/white and 
> green/red to the corners of the car, and a fourth wire to a repeater lamp 
> on the console if you have one.  As the corners light with the turn 
> signals the problem must be before where the green/white and green/red 
> from the hazard switch join the same coloured wires from the turn switch 
> near the column.
>
> As far as the turn signals go one thing you did not say before was whether 
> they lit up but didn't flash, or didn't light at all, or whether just the 
> backs lit and the fronts not at all.  New flasher units usually respond 
> better for a few weeks until they 'burn in', so that could well explain 
> why they are working at half-speed now whereas they didn't flash before, 
> and the problem is bad connections probably at the front lamp units which 
> is what you had off when the problem started.  However that would need 
> both sides to have pretty-well exactly the same level of bad connection - 
> possible but unlikely.  Alternatively it could be a common fault somewhere 
> in the green - hazard switch - turn flasher - turn switch circuit.  The 
> thing to do here is plot the voltage with respect to earth at each of 
> those point and see if you get a noticeable reduction in voltage from one 
> to the next, which will indicate a bad connection between the two.  You 
> can extend this test through the bullet connectors in the green/white and 
> green/red near the fusebox, and at each corner of the car, and into the 
> light units.
>
> PaulH.
>
> ----- Original Message ----- 
> From: "davewillner" <dwillner at ptd.net>
> To: <mgs at autox.team.net>
> Sent: Friday, September 23, 2011 9:32 PM
> Subject: [Mgs] Hazard blinkers at half speed
>
>
>>I replaced the original rubber gaskets for the front blinkers last week on 
>>the
>> MGB and both the blinkers/hazards stopped. I received a new flasher unit 
>> (they
>> sent me the wrong one...), I have the 2 plug connector unit under the 
>> dash
>> against the firewall. I took off the lenses and they started working 
>> about 1/2
>> speed, but the hazards will not work at all. Do I have a bad flasher 
>> unit, or
>> are the two front units maybe not grounding to the body as well as they
>> should?  Thanks
>>
>> Dave Willner
>> Stroudsburg PA
>> 59 TR3A
>> 70 MGB
>> 70 BSA 441 VS
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