You are a diamond my friend I will try this ASAP. Yes of course I will incorporate the dash dimmer to the wheel lights.

Now go have a good drink.

HAPPY NEW YEAR TO YOU

 

My posted circuit (post #40) uses capacitive cross-coupling of the two Pololu switches to take into account this recommendation from the Pololu switch description :-
"The ON, OFF, and CTRL pins on the pushbutton power switch do not require a pulse to operate, but leaving any of them in a high state could interfere with the switch’s other control methods, so we generally recommend using pulsed signals with them."
However, on reconsideration, in your specific application you do need to prevent both switches being on simultaneously, so direct cross-coupling (as you showed originally) would seem preferable. This over-rides the Pololu recommendation.
Here's a revised circuit suggestion :-

Note the addition of C1 and C3, to provide a power-on reset state with both switches off. D3 has been added to counter any negative load-dump transients on the power rail. Depending on the Pololu switches' characteristics, the contact bounce characteristics of your momentary switches and the interference levels in your car's electrical system you may need to tweak some circuit component values.

Edit:
Simulation suggests that C1 and C3 should be reduced to ~100n or even less.

 

Hi Alec

Thank you very much for all the work you have put into this for me, I’m very greatful.

I have ordered 2 spst 12v 40a relays and will hopefully give this a go as soon as they arrive. Will keep you up to date with progress. Just fitted the used control stalks and the original steering wheel so car is back on the road at least. Now gives me a little more breathing space.

Cheers mate

Regards

Dave

 

Just fitted the used control stalks and the original steering wheel so car is back on the road at least. Now gives me a little more breathing space.

There you go. After building your new circuits you can try them, by plugging them into the existing car wiring, before tearing the old stuff out again. To make sure it works.

 

Are you stating the obvious again?

 

Are you stating the obvious again?

Upon occasion, the obvious DOES need re-stating.

 

Are you stating the obvious again?

No just that you don't seem to -
1. want to do things normal.
2.like to be told how people usually do things like this.

 

Do you know what. I’m going to just stop you there and say thank you for your constructive criticism and pray you have a very blessed day

 

Shortbus has described me very well! One response from many folks that bothers me quite a bit is " I Hain't gonna do anything different than my great-grandaddy's pappy did it." That attitude often leads to making the same errors that have been going on for generations. The fact is that usually if something does not work several times it is not likely to work any better the next time, unless some changes are made. And I never suggest changes without a specific reason, only to solve some problem. In this case I originally had a totally incorrect understanding of the motivation for the change from the original arrangement, after the motivation was explained then the whole thing seems reasonable. Kit cars are always interesting.

 

Kit cars are always interesting.

Not really to me. I'm more of a figure it out and make it myself guy. Have built many over the years and made stuff for other peoples project on many, many more. When you go a car show with a kit car it's just like going in an OEM car, the only difference is the color they're painted.

 

Not really to me. I'm more of a figure it out and make it myself guy. Have built many over the years and made stuff for other peoples project on many, many more. When you go a car show with a kit car it's just like going in an OEM car, the only difference is the color they're painted.

I always try to learn from other people's work, either what works out well or what does not work so well. On most occasions it is far less painful or expensive to learn what did not work for somebody else, and avoid making that mistake myself. And it is also good to see that some ideas suggested wind up being ugly, so that I don't try the same thing and then want to change it because it is ugly. There is always something of some value to be learned, and some times it saves me a lot of work. There are a lot of folks around who know stuff that I don't know.