1990 Chevy Cheyenne Wiring Schematic wrong for my Chevy

ALASKAFOREVER2010

MEMBER
1990 CHEVROLET CHEYENNE
6 CYL
2WD
MANUAL
205,000 MILES

Got a 1990 C1500 Chevy V6.

The wiring schematic for a "full-size" Chevy shows the Ignition Switch Connector as:

AB is Purple and goes to the starter solenoid
C is Pink and goes to the ECM
D is Red and goes to the Battery (of course)

but then also shows:

ABC is Red and goes to the Battery
D is Tan/White goes to the Low Brake Switch

BUT HERE IT IS...

The AB is Pink, not Purple (pictures enclosed)
The C is Purple, not Pink
and
there is a grey wire, white wire, and an orange wire ALL leading to the ignition switch connector

HELP ME, its an EMERGENCY. !!!

I need a TRUE wiring diagram for a 1990 Chevy C1500 V6 manual transmission.

Thanks a million

3 Replies

JDL

MECHANIC
16,098 POSTS

Hi, I found this at MOD, not sure if that is what you need? Don't know if you can read it, I enlarged as much as I could and still get it in the picture.

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Wednesday, January 27th, 2010 AT 11:01 AM

ALASKAFOREVER2010

MEMBER
17 POSTS

Yeah, its not big enough and I tried to save the diagram.

The purple wire should be the right one. Just trying to jumper it to get it running temporarily.

Because:

I have replaced the ignition switch, the neutral safety switch, fuel pump relay, fuses, distributor cap and rotor. And STILL no spark.

Tried jumping from the battery to the purple solenoid wire that runs to the neutral safety switch, but nothing.

Tried jumping from the battery to the yellow ignition switch wire that runs to the neutral safety switch, but nothing.

Voltmeter testing was strange:

Getting 35 to 40V when turning the key and testing the purple wire underneath the truck straight from the solenoid/starter!

But no volts until you turn the key.

HOW CAN THERE BE THAT KIND OF VOLTAGE?

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Wednesday, January 27th, 2010 AT 4:50 PM

JDL

MECHANIC
16,098 POSTS

That voltage reading isn't correct. Gasoline engine, 12 volt system? Did you have the meter on the voltage setting? The purple wire has no voltage until the key is in the start position. Battery has a full charge and connections are good? Some of the name brand auto stores will check the starter. You have to take it off and take it to them.