I know I've seen this discussed before - but I used "search" and couldn't find it...

How do I make it so that my low-beams stay on when my high-beams are on?

Thanks!
- Scott

***ADDED***
I know it's doable - when switching from low to high beams, there's a clean switch, the lows turn off when the highs come on - but when you switch BACK, the lows come on while the highs are still on, and the highs only turn off when you release the "stick" <img src="/forums/images/graemlins/confused.gif" alt="" />

Depending on how they are wired you might be able to do it just by taking the ground for the lights straight to metal. Usually it runs through the switch and it disconnected when you turn the high beams on. Not totally sure on the Rodeo but it's an easy thing to try.

I wouldn't advise hooking up your hi and lows together. Not only is it illegal, it also shortens the life of the bulb, causes the wiring to melt and puts too much load on the battery and alternator.

I've only heard of this mod on Chevy's where hi and low beams are actually seperate lights. I suppose you could figure out a way to do this on Isuzu relatively easily, don't know if it would be a good idea though.

-Rob

Run a switched relay to the low beams. I've used hi/low in same bulb for many years with no problems. As far as legality, no different than driving lights. As long as you dim the high beams when you should, no one will ever know. Bulb life is not an issue, even when I was running H4s.

I've lit dual filaments for a while... I definitely experienced shorter bulb life, I suspect because of the increased heat. On an earlier vehicle that I bridged similarly, I burnt out the ground, so I doubled-up on my Amigo and ran a parallel heavier-guage second ground. No failure yet.

What I did was study the wiring diagram to identify the two signal leads for the high and low beams (each switches a headlight relay) and then switch them together. This way I can run high, low, or both. I eventually ran a diode inline with the switch so that the current ran through the switch only from high to low... that way I could still use the 'dip headlight' feature and switch back to low beams normally.

Randii

Bump on the shorter bulb life.

Running both might work on the stock bulbs, but I know that on high wattage bulbs like mine, it is a no no, because I would be running 180 watts = too hot.