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i have an 86 f250, its starts fine when the engine is cold but once it gets warmed up when i try to start it up again it takes a long time like its turning over really slow.
Hot starter=higher resistance and tighter pistons etc
Might try a heat shield around starter, bigger wires from solenoid to starter and larger ground wire.
Stock wires are too small and even my truck came with better 6 gauge but I plan on upgrading further to 4 Gauge if I can't find some 2 gauge soon. I have been looking for sme 2 gauge but have struck out thus far. I am only trying to find the larger size because I plan on upgrading to a 130 amp alternator soon to power accessories.
I've seen this problem occur when wires are old. I'm talking battery wires here. The solenoid could be going, as well as the starter. I tend to change them all when this becomes an issue. Look for "green" disease at the batter terminals, and all other battery wire connections(even the starter). Changing the battery cables alone may fix the problem, but may not as well. You can add a solenoid change to this as well, but it tends to not be the problem as much as the battery cables and the starter itself on Fords. The solenoid is inner fender mounted and not as affected by heat as a Chevy starter(starter mounted, near the exhaust) The only other thing to try is adding an extra ground from the battery to the body or frame. Make sure your batter post connections are clean as well.
Side note. Stick to sealed batter cables, as opposed to those "quick fix" battery terminals where you cut the wire back, and bolt it to the battery connection. Those are a "get you home fix" and nothing more. Sealed batter cables don't corrode inside the insulation as easily, and corrosion causes resistance!
All those things, plus clean ALL connections. You have to go over all the starter, solenoid, and battery connections making sure there is bright metal, and then tight.
Replace any suspect wires. I've been through this one before, speaking from experience.
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