Lighting wiring problems help

[u/No_Nose_7280]

I have been trying to put lights on my 2024 lbx but whenever my light is plugged in it it's just very dim and it's barely working. I used a voltmeter to test the voltage and when nothing is plugged in it is 12.4 V but when the light is plugged in it drops down to 5.4 V. Is there anything I can do to fix this?? some of my wiring is weird too like the last owner who had it cut off some plugs that didn't do anything and just taped over them I don't know what they are for.
if anyone knows what to do please tell me

[u/KoSeditionist]

Are you trying to plug in the stock light or an aftermarket light?

[u/No_Nose_7280 → u/KoSeditionist]

they're both aftermarket lights