1998 Chevy Truck My 98 Chevy Pickup will not turn over.

Tiny
SYNERCIVIC
  • MEMBER
  • 1998 CHEVROLET TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 134,000 MILES
Hello,
I am new to the forum and am in dire need of assistance.
My truck is a 98 K2500 standard car 4X4.
I replaced the dash and main wiring harness with a dash and harness from a 97, same model truck.
Every molex plugged directly in. The only difference between the trucks was the 97 had air bags. The yellow (airbags molex) plugs are not plugged in.
Every single thing on my truck works perfectly for the testing, but the truck will not start or even turn over.
Any ideas on what I should check?
The security lights stays on and I tried resetting it, but I have found multiple opinions on how I'm supposed to reset it?
Any help would be greatly appreciated.
Do you
have the same problem?
Yes
No
Saturday, December 6th, 2008 AT 10:29 AM

16 Replies

Tiny
JAMES W.
  • MEMBER
Well, on the now crank, you will have to start with power to and through the ignition switch. Then, through the neutral safety switch, and down to the starter selonoid. If you can get it to crank, you will probably have spark and fuel also. You may have to plug in "cheaters" in your air bag connectors. It may be telling the ECM that your airbags are deployed and locking your crank, spark and fuel. I'll have to do a little research on this and get back to you. Question off the top of my head. Why did you have to change wiring harness'? Hope this helps.
Was this
answer
helpful?
Yes
No
Saturday, December 6th, 2008 AT 8:04 PM
Tiny
SYNERCIVIC
  • MEMBER
James,
Thank you for the quick reply. I'm a custom car builder by trade and I am really stumped on this one.

I purchased the truck used, someone used it as a work truck and the interior was trashed.
The motor and trans were in great shape.

I purchased a new dash for my truck and the wiring harness was integrated into the inner portions of the dash. All of the molex plugs were exactly the same (except for the extra airbag plugs and one black molex), so I went for it. Now the dash is completely in 5 hours+ install time, and the truck will not turn over.
What is really weird is how all of the items on the truck work perfectly, lights ac radio wipers et ect.

I really dont want to tear the new dash out and all apart just to load it with my old harness.

I was able to get the security light to go out by leaving the key on for 15 minutes.
However, the truck will not turn over.

Over the last couple weeks I have some issues getting it started. Mainly when it was really cold. I would turn the key on and have to hold it for a couple secs and turn it on and off a couple times to get the starter to turn over.
Could this be a related problem and coincidentaly gotten worse with the new dash and wiring?
Was this
answer
helpful?
Yes
No
-1
Saturday, December 6th, 2008 AT 8:41 PM
Tiny
JAMES W.
  • MEMBER
Let's not panic just yet. From the way you describe it, you have a starter or solenoid problem. I would have someone turn the key to start while you test for power at the solenoid (small) wire. If the problem is intermitent, you may have to jury rig a bulb from the solenoid to the inside of the cab so you can see what's going on at the starter. If the light comes on, but no crank, it's got to be the starter. Let me know what you find.
Was this
answer
helpful?
Yes
No
Sunday, December 7th, 2008 AT 5:40 PM
Tiny
SYNERCIVIC
  • MEMBER
Alright.
I did some testing. I have voltage present on the crank fuse in the fuse panel with the key turned over. I also have voltage on the ignition and ecm fuses with the key turned over.

Per your suggestion, I checked the small red wire at the starter solenoid and do not have voltage when the key is turned over.
I do have constant 12 volts on the larger + positive terminal.

Thanks again for your assistance.
Was this
answer
helpful?
Yes
No
+1
Sunday, December 7th, 2008 AT 7:10 PM
Tiny
JAMES W.
  • MEMBER
OK, under the hood is a start relay located on the fuse/relay block. This relay works between the key start system and the starter solenoid. If the coil in this relay is weak, it will do as you described. Let me know.
Was this
answer
helpful?
Yes
No
+1
Sunday, December 7th, 2008 AT 7:42 PM
Tiny
SYNERCIVIC
  • MEMBER
James,
The relay in the fuse block under the hood is not getting power.
Also, I discovered another difference in the two trucks. The one I got the dash from is a manual trans and mine is automatic.
Was this
answer
helpful?
Yes
No
Monday, December 8th, 2008 AT 11:11 AM
Tiny
JAMES W.
  • MEMBER
OK, on the wiring harness you installed there should be a 2 wire connector for a clutch switch. If you jumper this whitch out, it should start. If need be, I can give you wire colors, but it should be easy enough to see. Let me know
Was this
answer
helpful?
Yes
No
+1
Monday, December 8th, 2008 AT 11:23 AM
Tiny
SYNERCIVIC
  • MEMBER
James,
There is a black molex plug in the vicinity where the clutch would be that did not have anything to plug into. It is black plug, with 2 purple wires, 1 purple/white stripe, and 1 brown/white stripe.
Was this
answer
helpful?
Yes
No
Monday, December 8th, 2008 AT 12:05 PM
Tiny
JAMES W.
  • MEMBER
The diagram for a '97 shows a purple and a yellow wire. For a '98, it shows 2 purple wires. Look at the base of the starter relay and see if you have a color match to what you have. The wires go directly to the relay.
Was this
answer
helpful?
Yes
No
Monday, December 8th, 2008 AT 1:19 PM
Tiny
SYNERCIVIC
  • MEMBER
Ok,
So the clutch switch wires go directly to the starter relay? The starter relay does have a purple wire on the bottom of it that looks like the coil trigger.

There are two purple wires at the clutch switch molex plug.

So you are suggesting I jumper the purple wires at the clutch switch molex to a 12v ignition wire to act as a trigger?
Was this
answer
helpful?
Yes
No
Monday, December 8th, 2008 AT 2:50 PM
Tiny
JAMES W.
  • MEMBER
Just jumper the 2 wires together under the dash at the connector. This will do the same thing as a closed switch. It should start right up.
Was this
answer
helpful?
Yes
No
Monday, December 8th, 2008 AT 3:19 PM
Tiny
SYNERCIVIC
  • MEMBER
James,

Ok. On the black molex plug that I assume is for the clutch switch, there are 4) wires. Two purple, one purple/white, one brown/white.

2) wires have 12volts with the key on. I tried jumping each 12v wires to the other side and it would not fire.
Was this
answer
helpful?
Yes
No
Monday, December 8th, 2008 AT 4:33 PM
Tiny
JAMES W.
  • MEMBER
If you have 2 wires with 12 volts, key on. Be sure they are only hot with"key on". If only one is hot with key on, this is the one you want to use. Jumper this wire to the purple wire going to the start relay. Does the relay close? If the relay closes, does the engine crank? I'm going to look at a different diagram to see what the other 2 wires are for.
Update: The purple and the Brn/wht wires are for the cruise control. That should leave the other 2 for start relay.
Was this
answer
helpful?
Yes
No
Monday, December 8th, 2008 AT 6:10 PM
Tiny
SYNERCIVIC
  • MEMBER
Thank you very much for your help.
You were exactly right. Jumping the left side of the molex purple wire (switched 12V) to the purple /white white did enable the truck to start.

I have a new problem. The automatic transmission does not want to shift out of first. It does park neutral drive ect, but does not shift going down the highway.
When it rains, it pours. :)
Was this
answer
helpful?
Yes
No
Tuesday, December 9th, 2008 AT 9:37 AM
Tiny
JAMES W.
  • MEMBER
You apparently jumpered the start circuit and got it running. Good job. Try jumpering the two wires for the cruise control, purple and brn/wht and see what happens.
Was this
answer
helpful?
Yes
No
-1
Wednesday, December 10th, 2008 AT 10:54 AM
Tiny
SYNERCIVIC
  • MEMBER
James,
I jumped both sets of wires. The ones you asked me to try. I took the truck out. Everything works perfectly. Except it does not seem to want to shift. The tach starts going up and at 45 mph it does not shift and drop down. The only other thing I noticed is that the instrument cluster indicator for Park, drive, neutral, ect is not lit up. Example. When I use the column shifter to change from Park to drive, there is not an indicator for me to see in the cluster.
Is there any hope to get it to shift in your opinion without pulling out the dash and rewiring it?

Thank you very much for your help.
Was this
answer
helpful?
Yes
No
Thursday, December 11th, 2008 AT 5:39 PM

Please login or register to post a reply.

Recommended Guides