Regional Jet 700 ER/LR (CRJ700)
Communication Breakdown; Situational Awareness
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Aircraft Aircraft Damaged; General Maintenance Action
Aircraft; Manuals; Human Factors
I followed the Aircraft Maintenance Manual (AMM) as much as I could that day; I went step by step. I personally think that the pictures should point out directly where all the electrical connections go and be a little more in depth with the narrative description. September 2014; I was installing JB5 into the aft Electrical Equipment Bay. I installed one out of the three leads incorrectly causing the JB5 to create a spark; and create a brown burn mark on the part I installed; once I reconnected the APU battery.  I was turned over the job from the previous shift which had everything disconnected; so I had to go by the Aircraft Maintenance Manual (AMM) to put everything back together and the visual reference provided to me. In the diagram it shows you the layout of where the wires should be reconnected; and on the [electrical] lead that was damaged; there was two connection points right next to each other; causing me to make a mistake and put the lead in the wrong place.
An Aircraft Maintenance Technician (AMT) reports he had attached an electrical lead on a CRJ-700 aircraft to an incorrect position during installation of Junction Box (JB-5) in the Aft Electrical Equipment Bay.  The cross-connection caused a spark and burn mark on the part he installed. Limited Shift turnover information and inadequate visual reference diagrams were contributors.