3.6K reactions · 115 shares | The $0 Trailer Light Tester That Actually Works Store bought testers don't always trigger your truck's trailer module. We built our own using old cabin chassis lights that actually test battery charge and brake controller signals. What's the most useful shop tool you've made from scrap parts? #TrailerLightTester #WorkTruck #FordTrucks | Whiteface Ford | Facebook
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