H4 and H1 headlight conversion

[Ebag333]

Huh, interesting. I wouldn't think they'd do it this way.

 

[wussyPup]

Huh, interesting. I wouldn't think they'd do it this way.

Yah, seems strange to me too. Apparently, Toyota is infamous for their "creative" ground switched circuits. Makes plug-n-play harness upgrades more interesting too.

-Steve

 

[mot]

FWIW, when I hooked up the DEPO's I could not get the H1 highs to come on when I did not have the ignition on, but worked as soon as I had the truck turned on.

Now, this is with the truck that came with the H4 harness and the H3/H1 harness already under the hood.

Not that this has anything to do with what you guys are talking about and chances are I probably did not have the connector on snug or something...

 

[WestAussie80]

If you're in OZ the e-bay ones would not work as they are supposedly for the LHD application.

If you want a pair for OZ/NZ/UK and cannot get them locally (or cheaply) I should be able to get a pair still.

ANYWAY, HTH's!
[/QUOTE]

Hi Mot,

I am new to this forum and contacting you from Australia. I have the same issue as the other Aussie guy, trying to fix the 80s (96 GXL turbo diesel) ordinary headlights... I went to all the trouble of having a decent set of bi-xenon projector units installed in to the standard 4"x6" stock lights... (lots of swearing went on) only to find they wouldn't fit into the original mounting brackets as the projector unit was too fat! (lots more swearing). I can't cut enough out of the original cradle to make to make it fit as it would be so weak it would just fold in half... But from what I am reading the Sahara lights will bolt straight in if I use the Sahara indicator too, which sounds better. Can you still get the clear lens (left hand drive) Sahara fit Headlights and indicators? I am thinking I may be able to instal the Bi-Xenon units I have spent so much on into something like that... Any thoughts?

 

[Ethompson84]

I'm still learning how to read Toyota's wiring diagrams, so I may not understand them correctly, but I spent some time comparing the wiring diagrams for the US '91 FJ80 and the rest-of-world '90 HDJ80 wired for H4/H1 lamps. A significant difference is how the low beams are grounded; the US FJ80 low beam is always grounded so low beams will stay on with high beams. The H4 HDJ80 low beam is directly grounded only when low beam is selected, when high beam is selected the low beam is grounded through the high beam indicator in the gauge cluster. I think this reduces the current through the low beams enough so that they don't illuminate at all when high beams are selected - they aren't turned off, just starved.

I'm grateful that the high beams on my H4s work; don't really know how much more they add to the H1s but I figure every legal watt helps.

-Steve

How can you make just the hid h4 low/high work on a h1 system? I currently have a high beam light on and no function of the switch. The bike seem to be in high now because the seemed to sink back when turned on. Can you help any help will be appreciated