12v issues please help! Half working electrics

[SquirrellCook]

Read this once a week until it sinks in. Not the link, the download!

https://motorhomebuilder.com/resources/victron-wiring-unlimited.47/

 

[Dansouth96]

Thanks for the replies.

The fuse board and the battery are both bolted to the chassis via two separate bolts. From the fuse board my wires run to the switches where they chain up the switches and then earth back on via a single earth cable to another bolt in the chassis next to the switches. How does that sound?

Another point, I tested the battery this morning at 12.6volts, the fuse board at 12.6v, the start of the live from the fuse board to the switch at 12.6v and then got some naff readings at the other end of the switch. Same for all the lives going to the switches.

I keep coming back to the random thought that it all must be wired correctly at it comes on when the power from the starter battery is put through the circuit.

 

[Sprinter 1 cup]

And your leisure battery is earth to what
To the fuse box
Or to the van's bodywork
Just run a test earth wire to fuse box and hab bat.

 

[Dansouth96]

Leisure battery is earthed the the chassis.
Fuse box is earthed to the chassis also via two separate bolts

 

[Nabsim]

Just as Sprinter 1 cup says I would run a temporary wire from fuse box earth to hab battery negative just to eliminate it at this point

 

[MarkJ]

Sorry if you've covered this - have you measured voltage at the lights themselves? Maybe you've got a larger than expected volt drop in the lighting cables? Then they might not fire until you get a much larger voltage going to them.

Have you tried a buck-boost voltage regulator with them?

 

[PeteS]

Thanks for having a think about this for me.
As I said I'm new to this despite it being my second conversion.

Just thinking now, I've currently got 2 out of three switches wired up but I've chained all the earth's together on all 3 switches, would this make the third switch part of the open circuit so meaning it's not working????

Hopefully yes!

Thanks

If you have 12.6v on one side of the switch and not the other side then either you have connected the switch wrongly or the switch is defective. You cannot have 12.6v going into a switch that is turned on and nothing on the output, that just cant happen unless it is defective.

The earths of the switches are irrelevant to your problem but I have to ask are the earths there for leds in the switches?

 

[st3v3]

are the earths there for leds in the switches?

Yes.

 

[Nabsim]

If everything works properly when the engine is running via the split charge but now when only on hab bank then it’s got to be wiring fault or fuse problem on hab supply/return side surely?