First, the customer service is EXCELLENT, but when I bought one of these used units it arrived in what looked like good condition, but it wasn't 100%. The outside lights on my car wouldn't blink - brakes and running lights all worked, just no outside blinkers. Richard and Junior worked with me to upgrade to the digital unit, which solved all problems, and there was no finger-pointing, just good customer service. I would go with their suggestion to use the modern solid-state unit instead of one of these used units.