5v box mod problem

[snipes2222]

I just got done wiring up a 5v box mod from madvapes and when i put the batts in it and turned it on with not atty connected it smoked(literally) one of the batts. I followed the instructions on madvapes and have checked and rechecked all the connections. I cannot find an issue with the wiring.If anyone has an idea why my mod is smoking batts it would be greatly appreciated. Thanks

 

[snipes2222]

So i noticed I was being stupid and had the master switch wired wrong. I rewired it as such, ground to the pcb instead of thru the switch and positive to the middle lug on the switch and the left lug positive to the pcb. Now im having a massive voltage drop from 6.6v to 2.5 as soon as I turn the master switch on.When i hit the fire switch it drops to 1.7v at the connector.The led doesnt work....nothing.I do not know small electronics that well but everything on the pcb is the way madvapes said to do it. Bleh

 

[bzmotoninja83]

Have you soldered anything yet?



(MY NAME IS BILL Z AND I APPROVE THIS MESSAGE)

 

[snipes2222]

Ya everything is soldered together.

 

[bzmotoninja83]

Something tells me you should have test fired before you soldered.
You know the saying, measure 2x, cut once.

Sent from my XT910 using Tapatalk 2

 

[snipes2222]

De-soldering isn't exactly a big deal.I solder nearly every day at work.I would just like some input on possible reasons the voltage is dropping when I turn on the master switch. I have no idea why it would lose 4v just by flipping a switch.

 

[asdaq]

If you had the positive and negative meeting at the master switch and fried a battery the 1st time around, chances are the switch didn't last either. With the batteries removed, check the switch for resistance with a multimeter as it should have a fairly low reading, but the voltage drop indicates it is higher now. Other segments of the circuit can be checked too, like the LED. The meter will even light the LED dimly if it still works.

 

[snipes2222]

Thank you asdaq,I will check the switch and the led.Luckily i have spares

 

[snipes2222]

So the led is fried but the switch tested at .2,although I dont know the original resistance was.Ill probably just change it out for safty sake.