93 Explorer Electrical Problem

Ok I have a problem. When I turn the key on power seems very weak. Door locks seem to struggle. Sometimes I can get the headlights on and everything seems to work just fine including door locks. When all seems well I try to start it and it instantly just dies. No Power at all. About 20 minutes later the power starts to come back. Back to the struggling door locks again. I'm not really sure if this is how it works but it seems as if its slowly charging up. The battery reads 12.6 V. Any suggestions? If you need more info let me know.

Thank you for reading
Kevin

Ok I have a problem. When I turn the key on power seems very weak. Door locks seem to struggle. Sometimes I can get the headlights on and everything seems to work just fine including door locks. When all seems well I try to start it and it instantly just dies. No Power at all. About 20 minutes later the power starts to come back. Back to the struggling door locks again. I'm not really sure if this is how it works but it seems as if its slowly charging up. The battery reads 12.6 V. Any suggestions? If you need more info let me know.

Thank you for reading
Kevin

Given its a 12 year old truck I would start with the battery cables. It is not uncommon to have corrosion inside the cables, or loose connections. Take a voltmeter and measure the resistance through the cables. Should be 0 ohms. Disconnect both battery cables before doing any testing - just a safety thing. Disconnect, clean and tighten all connections, including starter relay and starter connections.

Also, check your grounds. There is a ground point near the battery (part of the negative battery cable), one usually at the back of the engine where the ground strap attaches to the firewall, and one or two under the truck grouding the body to the frame. Clean and tighten these as well.