AC Help -2001 5.9L Cummins

[Bs702]

I recently replaced everything in the AC system on my 2001 5.9L Cummins.

New compressor, high and low side lines, and condenser and evaporator bottle; however, after having the system vacuumed and charged with refrigerant, the compressor will not engage unless using a jumper wire at the relay.

This was a pre existing issue before replacing the old AC system.

Any ideas?

I replaced the low pressure switch also.

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