The chain has to go on a specific way! You can call it the shorter end or male end but install the side circled in green over the wires going towards the bed heater.

Make sure your tape job on all wires that go through the chain is still intact and get your replacement chain in hand.

Feed the wires through the new cable chain.

Insert the cables into the new chain with the correct chain end facing up.

Make sure you have tape here, securing the thermistor wires to the orange sleeve.