Automatic Headlamps for 6V systems

This control was initially designed for 12V systems only, and that that application is rock solid. I have had a control in my '46 PU for over two years now, and it has always worked as designed.
We have had requests for a control that will work in 6V vehicles, and started working on that about 6 months ago.
Because of limited demand and cost considerations, we wanted to use the same circuit board and principal components, using a suitable 6V relay.
We had to find a relay with the same pinout so it would fit our circuit board. Unfortunately, nobody makes a miniture 6V relay with a large current capacity. The load capability of this relay is 10 amps, so you may need an additional large current capacity relay as an additional component.
The bigest problem we had was trying to get a proper turn-on delay. The root of the problem is that, compared to a 12V system, a 6V system has a relatively small voltage swing from off state to on state.
The bottom line is that we cannot get a dependable turn-on delay. When the ignition is first turned on, it takes about 20 seconds for the control to become fully active. When the photocell commands a "lights on" state, the delay will vary from 20 seconds to 2 seconds, and is related to how long the control has been powered up. The minimum turn on time of about 1 1/2 min. is still valid, and the ignition off, lights on, delay, works.
This is a bother when it is dark when you start your car, and you want the lights on right away. A workaround is really simple: manually put the lights on for about 3 seconds, and the control will latch up and then stay on. The windshield wiper turn-on (electric wipers only!) command works as designed.
Sorry, but without a major (and costly) redesign, the control (at 6 volts) cannot work as well as we would like it to. Of course, the really important function, that this control is going to turn your lights off, when you leave your vehicle, works as required. Any questions? Please call, we will be happy to talk to you.