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Why are your lights on your 1990 diesel D250 pulsate after starting running?
Wiki User
∙ 16y ago
Usually a pulsing lights means that some component in the charging system is not working right. Probably the alternator, but it could also be a bad battery that is not holding enough charge. Always check the battery and alternator connections first to eliminate corroded or loose connections. The alternator should run everything with out being connected to the battery while running. Start the truck and then disconnect the negative cable if the truck dies then the alternator is going bad or has bad connections. I aways replace the battery and the alternator together. That leaves me no guess work later. Good luck.
Wiki User
∙ 16y ago
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