On my 1999 f350 psd engine stalls if I apply the brake or turn signal.

The power sliding door (PSD) includes several interconnected electronic and mechanical components. Obtain a specific customer concern in order to efficiently diagnose and repair the PSD system. Begin diagnosis with a service writer. Ask the customer for as much detail as possible regarding the conditions under which a failure of the door was noticed. Always include the basic concern, such as "door reverses when closing". The following details might affect the performance of the PSD:
?€¢
Weather conditions, such as snow or heavy ice

?€¢
The van was parked on an incline.

?€¢
The van has been parked for a long time, which may cause a weak battery.

Refer to Power Sliding Door Customer Concerns for diagnosis. Verify that all of the mechanical components of the PSD are aligned and operating correctly before you begin diagnosis of the electrical system. The electrical components cannot operate correctly if the mechanical components are not operating correctly.
I just checked out a 1999 Oldsmobile Silhoutte yesterday , same set up there is a cable inside hooked to a motor that opens the door. The one yesterday had the cable hanging out the back of the sliding door , does yours ?
Does it open manually ? There are electronics involved , sensors ,switches , a module an a electric motor .
The power sliding door (PSD) includes several interconnected electronic and mechanical components. Obtain a specific customer concern in order to efficiently diagnose and repair the PSD system. Begin diagnosis with a service writer. Ask the customer for as much detail as possible regarding the conditions under which a failure of the door was noticed. Always include the basic concern, such as "door reverses when closing". The following details might affect the performance of the PSD:
?€¢
Weather conditions, such as snow or heavy ice

?€¢
The van was parked on an incline.

?€¢
The van has been parked for a long time, which may cause a weak battery.

Refer to Power Sliding Door Customer Concerns for diagnosis. Verify that all of the mechanical components of the PSD are aligned and operating correctly before you begin diagnosis of the electrical system. The electrical components cannot operate correctly if the mechanical components are not operating correctly.
The amount of force necessary in order to reverse the PSD depends on the position of the sliding door at the time of obstruction. The PSD action may not reverse if the following actions occur:

1. The PSD starts to close.
2. A gradually increasing force is applied on the sliding door in an effort to reverse the operation.

The PSD control module may interpret the gradually increasing resistance as a corrosive or dirty track. The PSD control module compensates for the gradual resistance on the sliding door by applying more power to the cable motor when closing the sliding door. In order to reverse the PSD at this stage of the sliding door travel, an abrupt and firm force is required.
The PSD control module operates in this manner in order to compensate for the wear over the life of the PSD. Over time the vehicle may experience the following conditions:
?€¢
A dirty track

?€¢
A corrosive track

?€¢
Ice build-up on the track (during cold weather)

The PSD control module is more sensitive to obstructions near the end of the sliding door close operation. The amount of force necessary in order to reverse the sliding door travel is less than when the sliding door started to close.
When the sliding door is within 2.5 cm (1.0 in) of the closed position, the door lock latch switch sends a signal to the PSD control module. The PSD control module determines that the sliding door is in the unlatched (ajar) position. This action causes the control module to apply full power to the cable motor in order to bring the sliding door to the fully closed (latched) position. The sliding door will close unless the force is greater than the cable motor at full power. The PSD control module de-energizes the cable motor and the clutch when the PSD control module receives a second signal from the door lock latch switch. The second signal indicates that the sliding door is fully closed and latched.
Power Sliding Door (PSD)
The power sliding door (PSD) provides built-in diagnostics. This assists the service technicians during troubleshooting.
The PSD has the following diagnostic capabilities:
?€¢
Diagnostic Trouble Codes (DTCs)

?€¢
Input/output tests

I jusatI

TURN KEY ON , REMOVE FUSES ONE AT A TIME ,TILL PROBLEM STOPS ,CHECK COMPODENTS , DIS CONNECT WIRES ONE AT TIME TIL PROBLEM STOPS,REPLACE DEFECTIVE PART OR RELAY

Sounds like a faulty turn signal switch. The brake light wire is routed through the turn switch, so it appears the turn switch has gone crazy.

bad earth on the bulb holder or the wiring, usually a good clean should sort it out.

I would sugest a bad earth, 1st remove the brake globes & see if the sockets that house them are rusty, if so clean with emery paper & refit globes. See if this works 1st. ps don't forget to clean the globes contacts to

either a switch problem or a fuse ,power supply is down somewhere?? BUT WHERE

An intermittent electrical problem can be maddening to fix. I have a similar problem in my truck. The connection to the engine fuse in the interior fuse block is loose. If I wiggle the fuse to re-establish contact, the engine will restart.

Next time the engine stalls, notice which of the lights illuminate on the dash. Compare this to which lights illuminate when you first turn the switch on and when engine will start. Applying the brakes probably shifts the loose connection enough to cause the engine to stall.

if wont turnover check small wire going to starter for short or ground out. my f250 7.3 was doing same i found small wire going to starter broken and pinched by frame. berrydalewolf

They are different bulbs man!

try tapping the hazard switch on and off a bunch of times fairly hard. these switches have a tendency to go bad and neither the hazards or turn signals will work