Miatav8,MstrASE,A&P,F wrote:
It could be many things besides beam alignment.
1) Make sure hi and lo are not reversed on the H4 plugs.
2) Voltage drop to the HI beam circuit. Even if the voltage to the plug is acceptable, the real test is the drop when plugged in and on since the HI element pulls more amps than low. Run a jumper from the batt pos to the Hi beam terminal (backprobe) on each head light, set to vdc, and switch on the high beam. The dvm will indicate how much voltage you are losing between the light and the battery through relays, switches, splices, connections, and wire gauge. Check the ground side too, though there is less to go wrong and you said the low beam was fine.
I was just looking through your build topic and found you are using a toggle for hi/lo. The switch should be rated for at least 10 amps at 12-14vdc. The female spade connectors can be pinched a little when disconnected to ensure a tight fit on the spade terminals. A loose connection can melt the switch.
2) The light housing.
Since you have H4 bulbs, you must have an aftermarket bulb housing. Some claim to be Hi/lo and have a single projector bulge in the center but those are really only a single beam with two different filaments. The only way a single bulge projector can be a true hi/lo is to have a servo controlled flap inside that blocks part of the beam for low and would not need to have two filaments.
When it is not so obviously wrong as to have a single bulge, quality also varies in the shape of the reflector and lens. I’ve seen some on Ebay that do not appear to have a reflector that would ensure hi projects any different from low. A better quality housing will have a glass lens versus plastic. I prefer hella brand but there are what appear to be some good housings on ebay, though they are hard to find in a sea of junk.
Thanks. I did wonder about the switch I’ll have to look and see what it is rated for. All my switches are marine gear. That double may not have the muscle. The housing and bulb came from speedway. The lense and bulb where a set it is all glass and housing is stainless seemed good quality. I had zero issue with the distance and spread of light on low better than my 2013 civic. Ok I have some to go on. Thanks a lot.
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I thought I would share the roadster kit I put together. It all works great together. A buff for the head, Columbia Omni-shade shirt, Bose Q30’s for tunes and a pair of chuck Taylor’s for the heal-toe action. Ha-Ha where not having any fun. I have to work on the accel enrichment part of the tune next. Pretty well stable up to 5k rpm. Now that I have some miles on I’ll have to check and see if I can start pushing the rpms. I don’t know this