Abstract: A power distribution center for an automotive vehicle electrical system comprises a junction block having a plurality of receptacles formed on an upper surface thereof to receive electrical components such as fuses and relays, and a holder insertable into engagement with the junction block to retain electrical terminals properly positioned within the junction block to make contact with the electrical components. A rectangular gap is formed in a side wall of the junction block. Passages extend from a recessed surface within the gap into the junction block. The terminal holder has arms which are inserted into the passages to engage the terminals and inhibit downward movement thereof, and an end plate which fits into the gap. The terminal holder end plate is configured to fit into the gap such that the outer surface of the end plate substantially matches the contours of the side wall and effectively seals off the openings of the passages in the gap.