1993 Chevy S-10 blazer Vortec 4.3L.
Replaced transmission w/rebuilt.
Question = Before I had the trans replaced, it went into what I believe is a safety mode- only 1 or
2 gears would operate.  (it had run fine with no problems for 240K miles)  However after having
put in a new unit, the same thing happened.

Have now sent it back to the transmission shop 6 times.  Each time they would return it, after
driving about 150 miles, the same thing happened.  The shop claims there is a short in the wiring
somewhere and a fuse is blowing, but as of now, they have been unable to find the problem.  
Any other ideas?
Yes, this does sound like a blown fuse. It most likely is one that sends power down to the
transmission to feed the internal shift solenoids. You may also have codes stored in the
computer- with or without a check engine light. Most of the large national parts store chains will
scan the computer for free. Codes for shift solenoids may be stored. When there is a loss of
power feed to the trans, it does go into a default shift mode.

Check all the fuses in the dash fuse box and the underhood fuse box- if it has one. Replace
any blown fuses. Now to find out where the short is can get pretty involved. There are a few
placed that are common.
1. The large wiring harness that goes over and near the power brake booster in the drivers
side firewall under the hood.
2. Following that harness to the back side of the engine as it starts to go down to the
transmission connector.
3. The ignition switch wiring harness under the dash that runs down the steering column and
into the firewall.
4. Or anywhere in between these locations.
Best way to find it is to install a circuit in place of the blown fuse, turn the key on- engine off,
and pull on these harness locations while listening for the circuit breaker to pop. That will tell
you where the short is. Then you would need to get into the wiring harness at that location and
check each wire for being rubbed through on something metal. It will most likely be a pink wire.

If you do not have a circuit breaker, then installing a good fuse and doing the same. Have
someone get close to the fuse while you are doing this and listen for the fuse to pop.

2000 chevy blaze 4.3 L Vortec V6.
Question = When I turn my truck on or put it in gear the reverse lights are on even in drive...How
do I fix this so they only come on when I am in reverse????
You probably have something faulty or shorted inside the neutral safety switch. Also called the
'park/neutral switch', it is located on the side of the
transmission. A quick look underneath and
you could see if there is any obvious problem like wiring rubbed through or shorted.

If not, I'd replace the switch. The connectors are glued in from the factory, so if you've never had
them or the switch replaced before, I'd recommend getting new pigtail connectors along with the
switch and wire them in per the directions
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Engine Operation
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4200  4.3L Vortec

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1993 Chevy S-10 Transmission Still Shifting Wrong