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Unread 01-27-2010, 05:56 PM   #1
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Default Wiring diagram for chevy truck

Electrical problem
1990 Chevy Cheyenne 6 cyl Two Wheel Drive Manual 205000 miles

Got a 1990 C1500 Chevy V6.

The wiring schematic in the Chilton 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 IN MY TRUCK...

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.

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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ignition-swtich-wiring-002.jpg   ignition-swtich-wiring-001.jpg  

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Unread 01-27-2010, 06:10 PM   #2
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Have you tried jumping straight to the solenoid? Start with the starter/solenoid and work backwards from there. It's so much easier.

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Unread 01-27-2010, 06:42 PM   #3
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When you turn the key forwards does the dahs come on?
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Unread 01-27-2010, 06:53 PM   #4
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Default yes, lights come on dash

Yes, you turn the key, and no clicking, but lights come on in the dash

Can I just snip the wire coming from the solenoid from underneath
the truck to jumper it?

Or should I jumper it right from the solenoid itself?

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Unread 01-27-2010, 07:02 PM   #5
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Just jump the positive wire from the solenoid to ground and it should start turning over. If nothing happens then either there wasn't a good connection or either the starter or solenoid needs replacing.

And you shouldn't snip any wires

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Unread 01-27-2010, 07:08 PM   #6
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Default solenoid reading....

Okay, I wont snip it....

its just there is a metal plate nearly blocking all access to the starter, just have to squeeze my way in there I guess.....so just run a jumper wire from the solenoid to a ground?

Or run a jumper wire from the solenoid to the battery?

But still, with a voltmeter it reads 0 Volts as it should until you turn the key, then the solenoid wire jumps to about 38 Volts....and it should be 12V.

THANKS FOR THE HELP

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Unread 01-27-2010, 07:32 PM   #7
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In a sense you have to give power to the positive terminal on the solenoid. You can get that from either the negative terminal on the battery or any unpainted metal surface.

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Unread 01-27-2010, 07:34 PM   #8
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k....I'll try it

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Unread 01-27-2010, 07:44 PM   #9
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Why don't you just take the ignition switch out leave it plugged in and move the switch position when you need it to start. My piont actually was if your dash lights then the ignition system on the truck is hot and you should have spark just need to jump starter.which can be done at solenoid just like felipe said.
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Unread 01-27-2010, 07:51 PM   #10
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Alaska I know you don't know whats wrong but have you determined if the problem is in the coloum pre ignition switch or from the switch to the starting system? I don't do columns but this isn't a complex system we have to be missing somehing simple.

Go over the basics you know
Key turns forwards does dash light?
Key turned to crank does it crank?
When key is forwards does the fuel pump relay energize?
When key is forwards does ing coil energize?
Does starter and fuel pump have power on other side of relay?
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