The 80 headlight relays are known to give problems as the vehicle wiring ages, if you are lucky you will simply replace the relays (there are two, one brown and one black), if not so lucky then the relay sockets will be burnt, mine is about to have it's third relay set, the sockets not too bad but will not take much more abuse. TBH this should have been done the first time it happened but hey you know how it is.
So I am now looking to insert my modded piece of loom. The idea is to use the OE connections that go to the actual bulbs, this will trigger the relays which only need a fraction of the power needed to make the bulb work. This will take not only load off the OE loom but also off the OE changeover relays, the result should be not only the aforementioned aging parts living longer, but also the lights will actually be brighter. I personally think the 80 lights are great on main beam however, the dipped beam is pretty poor on unlit roads. My headlights are not the original, they were replaced about five years back to suit driving on the 'wrong'

side of the road in Spain, so this mod will get the best out of them.
If you decide to use the 'off road use only bulbs' 100/85 watt main/dip, and the 100 watt for the spots, all of which fit straight in the stock holders (570 WATTS = 48 amps if using the PINK OPTION) then this system will handle them with ease, although you should increase the earth cable size from the bulb holders, TBH why not do it anyway? Remember the virtual double wattage of the stock bulbs does not double the distance they reach or light up, that is the job of the reflector, you will however gain some additional distance but more importantly the lit area will be more crisper and defined so easier on the eyes. Running the stock alternator (80 amps) you might find this is a bit too much when running other gear, HRW, heater fan, decent stereo, and so forth, if your alternator is stock then you might want to just put the higher wattage bulbs in the spotlights only?
This diagram is pretty much fool proof, assuming I have it right in the first place

, it uses the wiring already fused by Toyota right up to the headlamp. The 'norm' is to wire the relays to a fuse block and then double out via a fuse to each light, this way you never lose both dipped beams or both mains at the same time unless the OE relay fails WHICH IT WILL if you do not do the mod! By using the OE fused wiring it cuts down on 'dodgy' wiring that may be installed un-fused, and of course keeps fault finding as per OE. This method of wiring to the relays (standard 4 pin type) is a single fuse for each pair (one main/one dip), it is heavier than OE and assuming the wires are run correctly i.e. no chafing then there will not be a problem. The chance of a bulb blowing and taking out the heavy fuse extremely unlikely, having said that, if you wanted to then you could of course fuse each #30 connection, in the real world not necessary. This method will allow a fuse to blow and still retain one side dip and the other main. Note D1 and D2 diodes (typical 1N4001) are to be fitted as a precaution, the supply from the opposite side main beam will travel back up the loom and in theory to an open circuit. If you are a bit savvy then you can check with a MM, if not sure then fit them anyway. It can do no harm whatsoever but, as this forum is read by different consumers throughout the world there may be wiring differences so it pays to be a little cautious here.
I have also added the PINK OPTIONAL wires with diodes, this will mean when the main beam is selected you get four OE main beams PLUS the two dip beams, the light output is pretty good lighting up the foreground and the sides around winding unlit lanes. Note this will draw around 28 amps, which is around 10 more than stock using standard wattage bulbs.
I am taking some great pain killing meds at the moment....................man, so if any hawk eye's see anything looking 'iffy' let me know asap and I will post up a modded version..........when the sky turns from green and yellow dots with floating orange cows, back to blue
regards
Dave