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If you determined that power is present at the lights by checking with a voltmeter; it may be that there is a high resistance connection somewhere in that circuit (likely a bad back up light switch or a bad battery ground connection) which passes enough current to make the meter read; but causes the voltage to drop off when a bulb is connected to the circuit. Using a 12 volt test light (which draws more current than a meter) can eliminate this issue when testing for voltage.
If there really is plenty of power available at the bulb, and the contacts in the socket are good; then there is a poor ground connection between the socket housing and the vehicle frame and battery. Sometimes a dedicated ground wire has to be run from the socket assembly to a clean bolt in the body or frame.
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