Quote:
Originally Posted by The Rocknrod
And or install a Starter Relay.
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Don't. This would label the OP as clueless. Adding an other solenoid is like duck taping a new leg toy yours when it gets sore. The old one is still there doing tha same job it always has.
Slow crank is internal solenoid contacts switching the starter on/off, or the big battery cables bad, resistive connections on same, grounding something other than the block, dead battery, or a starter problem. Note how few problems are the solenoid. All cranking current flows through the big cables. Rarely, the starter is bad.
If the solenoid makes no noise or clicks trace the circuit from the battery + terminal, small red wire all the way to the solenoid S-terminal purple wire.
Get a long piece of #12 stranded wire and put 2 alligator clips on the ends. When the problem occurs, test. Connect one end to the solenoid S-terminal. Put the truck in park or neutral. Touch the other end to the battery + terminal. Any change?
A charged battery is 12.6V with a small load. Anything less, even 12.5 is in need of a charge.