Voltage drop over switch

[Newf]

I have wired up a 7" stand alone monitor with front and rear facing cameras. I put a switch on each camera circuit so that I would be able to turn them on and off when I chose to.
However when I turned everything on, the cameras didnt turn on.
If I remove the switches from the circuits the cameras work fine.
So I'm wondering if the switches are causing too much of a voltage drop so that the cameras dont fire up?
If so, is there any switches that would work in this instance or any other suggestions on whats going on.
Or do I just remove the switches from the circuits and have the cameras on all the time when the ignitions on and just switch the monitor on/off when required.
Thanks.

 

[DXX]

Are you sure that you installed latching switches and not momentary switches?

 

[Newf]

I have both, but I used a latching switch and also tried an illuminating rocker switch but same problem.

 

[Pete C]

Have you measured the voltage after the switch when turned on ?

Pete

 

[Phil_G]

Nah, even the cheapest crappy chinese switch would switch a camera. If its multi-pole, are the wires on a make and a common of the same pole?
Can you post a pic of the rear of the switch please?

 

[Newf]

This is the rocker switch -

And its terminals -


This is the latching switch -

And its terminals -


Voltage at camera with the switch out from memory was 14.7 volts. Will need to wait till tomorrow to double check what it was with the switch on.

I'm by no way an electrical expert, especially 12 volt, so appreciate any help/ suggestions. Ta.

 

[Pete C]

Did you get any pin-out info with the switches ?
Showing us would be useful.

Pete

 

[Phil_G]

On the toggle switch you should have one wire to the centre tag and one to either of the side tags.
On the push switch, one wire to + and the other to NO. If you want it to light up, pos to +, neg to - and camera to NO
Is that the case?

 

[Newf]

Info for rocker switch


For latching switch


For the latching switch I was going per diagram 1 so that the switch light and the camera would go on and off at the same time.
To the best of my knowledge I hooked up the positive supply (acc live, from fusebox) to the switch terminal to the left of + and - posts (on diagram); jumped positive post of switch over to the right hand post of switch then over to positive feed into camera.
The negative from the camera went to negative ground post in rear quarter. Only slight change from the drawing would be that I ran the negative post from the switch to the negative ground post under passenger seat, so not directly connected by wire (if thats what the diagram suggests, maybe not). The light on the switch goes on and off as it is pressed but camera doesnt.

 

[Newf]

On the toggle switch you should have one wire to the centre tag and one to either of the side tags.
On the push switch, one wire to + and the other to NO. If you want it to light up, pos to +, neg to - and camera to NO
Is that the case?

I'll have another go in the morning to double check I had it that may round and see whst it does, check voltage and take some pics if need be.
Cheers all for the help so far.

 

[Loz]

What happens if you power up the monitor with a camera already switched on?

 

[Newf]

So with a fresh start this morning I went over everything again. I now have cameras that switch on and off as I wanted.
I think the issue was a very dodgy negative connection back to chassis earth point.
Still to try the latching switches but need to solder some tails on these later to make it easier.
Thank you all for your assistance and advice.