I have an 86 f250 with a stock 6.9 idi. I just bought this truck 2 weeks ago so I'm still working out some bugs. After the truck starts, the glow plug light will come back on for a couple seconds then shut off. A click comes from the relay so I'm assuming they're still cycling with the truck running. I was wondering if this would go with the ignition switch or the relay. Any help would be appreciated. Thanks!