90mm no turn over

hey yall i need a some help my 90 mm wont turn over but will roll start fine and the starter only works if its runing i put another ecu in it its the same truck that the ecu burnt out in idk what model the ecu is i put in it is this the problem or somthing else i put another starter on it to and still the same result. thanks

Hi Dale,

You have a problem with your starting system. This is one of the easiest system to troubleshoot. it includes:

The battery,
the negative battery cable and its connections,
the positive battery cable and its connections,
the ground straps from the engine to the frame,
the wire from the ignition switch to the starter,
the ignition switch,
neutral safety switch (automatic transmission only),
clutch safety switch (I don't know if your truck has one),
the starter and the solenoid.

Remove the starter and battery. Have them tested at an auto parts store.

Since the truck runs when you push start it, your ECU is probably okay.

Check, clean and tighten your battery cables.

To check for a bad ignition switch or the small wire connected to the solenoid, run a wire from the battery and touch it to the solenoid connection. The engine should crank.

Next, determine if the ignition switch or the wire is bad.

John

Thanks a whole lot im gonna try it when i get home

ok so if the starter turns only when it touches the frame ground that runs from the negtive side of the battery to the battery box to the frame to the motor what does that mean

Got it runin and had to do a few donuts thanks for the pointers i ended up havin to run another ground from the battery box to the back 8mm bolt on the back of the starter