How do you adjust the steering toe on a L130 lawn mower?

Repair your vehicle right away. Just click on the link I attach.
JOHN DEERE L100 L110 L120 L130 LAWN TRACTOR SERVICE TECHNICAL MANUAL TM2026

If the tie rod end has been changed, you will need to adjust the toe in by dropping the tie rod end from its connection to arm. Not the steering rod. Tighten or loosen the tie rod end on the steering rod until there is a slight toe in. Re install the tie rod end into the steering rod. If there is too much toe in, the wheels will spread when in reverse and steering is impossible. It may take several attempts to set the toe in properly. When proper adjustment is met, steering will be easier or as it should be.

Most are not adjustable, however I have heard of replacing the bushings on the knuckle, however if it is worst than that, it is possible to heat and bend the spindle. However you do take the chance if damaging it.

I have not worked on these lawn mowers but there is plenty of posts on different lawn mower sites on how to rebuild the John Deere L1xx series transmissions. I would suggest have a read of this site. It also mentions the parts required and the cost. I understand these lawn movers use the K46 transmission system.

TuffTorq K46 Repair Guide with Pictures

You can try streightening the steering link rod. or just buy a new one. also make sure the holes on the axle brackets arent wallard out.

There is no adjustment. Same problem here. Have to replace rims, bushings and spindle axles. Not cheap

streeting on poulan rider drops down you have to pull up on it to street it how to fix this mower is a yr old

http://manuals.deere.com/cceomview/OMGX21647_K3/Output/Index.html?.

The Toe In/Toe Out will have to be adjusted (if the steering rods to each front wheel have sleeves), just like on a car.

Toe-in is the operating angle of front wheels on a riding tractor. If the front edge of the wheels point inward, towards each other, then the wheels have toe-in. If the front wheels point outward, the unit has toe-out (or negative toe-in). Adjustment of toe-in is necessary to maintain proper steering control.
Unlike automobiles, our tractors have pre-set camber and caster settings. Therefore no camber or caster adjustment is necessary.
Acceptable toe-in adjustment range for all of our lawn & garden tractors is anywhere between 1/16"-5/16". With 1/8" serving as the optimal range.
Detailed toe-in adjustment procedures for the various models of tractors are reviewed in the "Adjustments" section of the Operators Manual for the tractor.
If tires are not toed-in properly after adjustment, it is likely that other part(s) need service or adjustment. axles, wheel bushings, control arms and other steering components may be worn or damaged and will need inspection. Service these items as needed.
You haven't stated your make and model, so I can't send you the manual with the exact procedure for your machine.

You should price a new wiring harness,around $80 so there is not much reason to spend a lot of time trying to find shorts or open wiring.