After a steering column change, ignition switch powers dash/lights/aux but starter will not turn?

CODYKAREY

MEMBER
1999 GMC C1500
5.3L
V8
4WD
AUTOMATIC
300,000 MILES

The ignition mechanism down inside the OG column was seized up. I’ve since switched with a matching column from the wrecker and all things function correctly except for the actual starter itself and the backup lights when the truck is in reverse.

I’ve dialed this into likely being something funky with how I’ve reinstalled the wiring that connects the neutral safety to the steering column and have since located this lone rogue connection.

Any help greatly appreciated, but does anybody know where I’m supposed to plug this thing into? Hah!

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi,

The backup lamp switch is on the transmission, so I'm not sure what you are seeing near the steering column. Also, there are two fuses you need to check in the under-hood fuse box.

If the backup lights don't work, are you sure the shift linkage is adjusted properly? Will it crank in any other gear?

Take a look at the pics below and let me know if they help with the reverse lamps. I think once we get that figured out, the starter will also engage.

Let me know.

Joe

See pics below.

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Tuesday, June 27th, 2023 AT 7:50 PM

CODYKAREY

MEMBER
2 POSTS

Thanks so much for your reply! These were helpful, and now the backup lights are functioning properly.

The column needed to be replaced due to a mechanical seize deep down in the ignition mechanism. That’s been addressed with the new column that’s now properly in there from what I can tell.

Alas, still no life in the starter.

- starter will not crank in any position

- shift linkage is well adjusted, and I can cycle through all positions.

Thanks Joe! I really value your expertise here.

Cheers

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Tuesday, June 27th, 2023 AT 8:57 PM

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi,

Okay, I attached the starting system circuit schematic below. I highlighted three fuses I need you to check. In addition to checking the fuses, confirm there is power to and from them.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Note: The ignition fuses A and C should have power at all times, regardless of the key position. On the other hand, the crank fuse will only have power while the key is in the start position.

Check these and let me know the results.

Take care,

Joe

See pics below. Note: I had to cut the page in two to make it readable. I did overlap them so you can follow from one to the next. Pics 3 and 4 are the fuses. Pic 3 is under the hood and pic 4 is under the dash, the left side.

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