red first, black last is correct. always connect positive cables first and negative or ground cables last
On the starter if 1 pos cable or midway if you have 2 pos cables & is remote mounted between.
The 1998 Chevy Silverado pickup truck shift solenoid can be found on the left-hand side of the engine. The shift solenoid will be near the center of the transmission.
The starter solenoid? Attached to the starter. Round thing, wires, etc.
try changing the battery, your battery might be bad you never know, it might not hold a charge The starter relay needs to have good contact. Even though it may click, the contact is dirty and not good enough to transmit strong electrical power to the starter. Change the starter relay which is connected to the positive cable to the battery. Do not confuse the starter solenoid with the starter relay.
The starter solenoid is mounted directly on the starter.
Your starter solenoid is sticking. Replace the starter solenoid and you should be good to go.
I'm not sure what heater cables are, need more info.
The 1993 Ford F2 50 pickup truck injector solenoid is attached to the injector fuel pump. The injector solenoid should be labeled as such.
On the frame rail in front of the spare tire.
under neath the pickup in front of the spare tire. The black box has the charcol and the round piece is the solenoid.
It's usually easier to remove the starter from the truck and do the work on a bench. Remove the bolts that hold the solenoid, put new solenoid in it's place. Reconnect.
The starter solenoid is attached to the starter.