Friday, Mar 21, 2014 at 14:29
Grey YesMad
I don't own a 70 series but a general comment.
With a caravan or trailer there is no difference, it is the number of operational lights fitted ie, multiples of Brake lights, multiples of Park lights and also indicators which may have a few side repeater lights.
So it is the multiples of which are the issue and the amp loading.
Besides the load on the wiring the multiple flashers ie. more and more will usually affect most flasher systems UNLESS the vehicle has a rate controlled flasher unit.
After knowing what the system has, then the issue of the vehicle's ability to supply and not cause voltage drop or heating in the vehicle loom is also to be considered.
The issue of LED lights is another thing. Usually an ALL LED trailer/van will have not much problem running lights from the vehicle.
Some vehicles use two relays driven by the flasher unit so the trailer/van Indicator lights run, and don't affect the vehicle flash rate.
If there is heavy loading of tail light circuit or stop lights ie multiples then the Tail lights and stops can be relay driven too. While your at it a reverse through signal through pin 2 could also be done if required.
Having a heavier feed wire from the battery to the rear, 2, 4 or even with reverse, 5 relays could be switched by the vehicle wiring with minimal/almost zilch vehicle loading and the outputs of the relays run to the trailer plug and all lights therefore run from that heavy wire.
Dmax has towbar with two relays which do this but not the other functions. other vehicles are now following. Used also on CANBUS systems so the vehicle isn't affected in anyway.
It is all your choice of course, but not 70 specific but the same issues apply.
PS the good thing is, when checking, you can hear the relays switch on and know what should be working and when.
Cheers
Ross M
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