few under dash wire problem / questions ? UPDATE : more questions

[sweetk30]

body was donated from a 1987 c-10 v8/700r4 truck full loaded silverado .

wipers with OR with out delay box dont park at the bottom unless i turn them off there .

dash cluster out was testing for brake light switch problem . fixed it and then i went and held the brake lights on and pushed the 4 way switch and the plug for the gauge cluster started smoking NOT touching any metal . undid 4 way switch asap . ? ? ?

brake lights rear some times no left brake . bulb like new removed and tested 100% .

i am thinking turn signal/4way switch is junk . time for new . = brake light interm on/off left side and 4 way problem .

also no power windows or locks on both door switches . have not dug in yet .

what do you guys think ? i hate wiring diagnostics .

 

[6872xtc]

The wipers not parking is the park circuit in the motor. At least that's what it was on my '90 Jimmy.
I believe that you are on the right track about the turn signal switch being bad. It switches which one is flashes or is connected to the brake light circuit.

Check the fuse for the windows and locks. Maybe there is a wire shorted in the door jam which killed the fuse. Hopefully no wiring problems.

 

[sweetk30]

The wipers not parking is the park circuit in the motor. At least that's what it was on my '90 Jimmy.
I believe that you are on the right track about the turn signal switch being bad. It switches which one is flashes or is connected to the brake light circuit.

Check the fuse for the windows and locks. Maybe there is a wire shorted in the door jam which killed the fuse. Hopefully no wiring problems.

if door wiring problems i have full man guts and blue door panels ready for action .

 

[6872xtc]

if door wiring problems i have full man guts and blue door panels ready for action .

While I understand your view, I like being able to roll the right window down easily. The left side is no different to me power or not.

 

[ChrisPerry]

Are you SURE your cab ground is good?

 

[sweetk30]

they didn't work before the running truck was cannibalized for the whole body also . @ChrisPerry

 

[sweetk30]

swapped another wiper motor unit on and still no park .

i wounder how i could test the wiper unit to verify its them or the truck side .

my old truck i lived with no wipers for 5-6 years ( love my rain-x ) then fixed them and had them working but same problem no park .

 

[6872xtc]

Well crap!
I tried different switches and pulse modules on my '90 before going to the motor. I guess that I am no help, unless the motor you tried is bad too.

 

[sweetk30]

swapped the turn signal switch tonight . had dash plugged in this time . had known good used flasher in the fuse block location incase other was funky . still dont like the 4 way position used . as soon as it did nothing i pulled the knob to release it and then fasten seatbelt light cycled . ..

am i missing a flasher location ? could it be missing a ground back at the box to truck frame plug location ? or does it get its ground thew the box to frame and up ?

 

[sweetk30]

i tell ya even to this day the stupid little stuff still gets me .

i did some more digging around and found the 4 way flasher . i swapped him from the 4 way flasher off the other truck that was known good . . . . and BAM ! they work no problems. i guess its time to cut open the bad one and see why .

that stupid simple stuff every time. 30 bucks for new switch and 1hr time for a simple used flasher fixing the problem priceless

posted this set of questions on another forum . this nice guy posted up this simple easy to read and understand setup on the wipers . :
No park is usually the parking cam or switch inside the wiper motor.
The wiper motor has two plugs. Park has two connections and RUN has three. Both Park and RUN have a gray LO speed wire. The Black/Blue Park wire is grounded by the wiper switch when it's set to off. The Park switch inside the motor feeds that ground through to the LO wire til the park cam opens the park switch at the bottom of the wiper arm sweep.
Once upon a time you could buy the parking switch and the parking cam from GM. Now you get to buy a re-built or used 1985-1991 squarebody wiper motor.

If the delay function is not working you can probably replace the electrolytic capacitors on the circuit board, slobber some heatsink paste on the FETs and re-assemble it... I lean toward the electrically non-conductive white Zinc oxide rather than the very electrically conductive CPU pastes like arctic silver etc. I've revived three or four of the 78-82 modules this way.

The 1987 wiring diagrams are a PITA to read. Probably Mr Goodwrench thought so too and loudly voiced his negative response to the difficult readability because it's a one year only mess.
If the 1988 or 1989 diagrams match the wiring you're working on they're much easier to read.

i used this info to remove / test / verify my park switch worked on the wipers . i then removed / installed the plug 20-30 times to scuff up the contacts and now she works delay and park position just fine . that style plug gm used is open to the air a lot and gets real crunchy needs a cleaning and dialectric grease .

 

[frankin5]

At fuse block there should be a pink wire plugged in to the middle connector on second row. There is a harness between doors under dash. The locks plug in just below the windows on the fuse block. There is a harness under dash that has relays.

 

[sweetk30]

so i have the majority working now . windows need a good service but slow and steady they work . maybe a relay kit is in order if i even keep them .

the power locks still no go . all fuses have been checked .
no headlight warning buzzer / seatbelt buzzer ( light works tho ) .

any ideas were to look next for common problem points ?

 

[6872xtc]

On the power locks, could it have a broken wire in the door jamb? But I would think that one side would still work, even if it didn't work both doors.
I know that they can break a wire, but I don't know if it's common, or if previous owner abuse plays a factor somehow.

 

[dyeager535]

Without looking at it closely, on the PDL, I've had them stop working when the bolts holding the solenoids to the doors loosened up, but if you have nothing, check wiring or the relay. I want to think the PDL relay is on the convenience center?

 

[Carcinogen]

no headlight warning buzzer / seatbelt buzzer ( light works tho ) .
any ideas were to look next for common problem points ?

On my truck the wire for the seatbelt buzzer runs down the drip channel under the door weatherstrip, it was all chaffed up causing problems. And as it is only one wire the seatbelt reel has to be grounded.

 

[frankin5]

This might help out.