Hazard lights not flashing with trailer connected

Submitted: Saturday, Sep 20, 2014 at 15:58
ThreadID: 109561 Views:2863 Replies:4 FollowUps:2
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I have 1998 Toyota 105 series Landcruiser. When I connect trailer or caravan, hazard light when switched on only flash once and stop. All other lights work fine. Trailer and caravan work fine on my other 2003 Landcruiser Sahara and 2003 Ford Falcon. So I know it is not the towed vehicle at fault. I'm suspecting some overload on relay or such. Any ideas?
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Reply By: Member - Tony H (touring oz) - Saturday, Sep 20, 2014 at 17:32

Saturday, Sep 20, 2014 at 17:32
It will be the 'flasher can' that needs to be replaced....was a problem with the early 100's although yours is not an 'early one' that's where the problem will be. :-)
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AnswerID: 539312

Follow Up By: Jonty - Sunday, Sep 21, 2014 at 07:38

Sunday, Sep 21, 2014 at 07:38
Try lower watt globes in the front indicators.
FollowupID: 823955

Reply By: Mikee5 - Sunday, Sep 21, 2014 at 13:02

Sunday, Sep 21, 2014 at 13:02
The flasher relay (flasher can) is rated to a number of watts, this is the sum of the wattage of all the globes in the circuit. You have added more globes or watts by connecting the trailer, and probably exceeded the rating of the can, this will either slow it or stop it completely. Either reduce the wattage of some globes or replace the can with a higher rating.
AnswerID: 539338

Reply By: Zippo - Sunday, Sep 21, 2014 at 15:31

Sunday, Sep 21, 2014 at 15:31
Two straightforward solutions are available: Replace the flasher unit (there are flashers which function independently of the connected load) OR fit LED "bulbs" in the van/trailer as they present a far lower load than incandescent bulbs.
AnswerID: 539351

Reply By: Hank V - Sunday, Sep 21, 2014 at 23:04

Sunday, Sep 21, 2014 at 23:04
I forgot to mention: the failure of the hazard lights came on suddenly. Both a caravan and this trailer have been in use with this land cruiser for over 10 years without any issue. If it were an over wattage issue it would have been from the beginning I would have thought. That's why I suspected a fault and maybe the flasher can is the issue, but I'm not sure. Even my neighbouring trainee auto electricians are unsure.
AnswerID: 539377

Follow Up By: scandal - Monday, Sep 22, 2014 at 17:33

Monday, Sep 22, 2014 at 17:33
How much will a flasher unit cost??
They do fail over time, I would be inclined to look there first, if your not sure and don't want to waste $$$ to find out it was something else, just swap one from a similar vehicle and see how you go
FollowupID: 824023

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