Re: Dashboard wiring

Posted by HH56 On 2017/2/19 11:22:10

It is not a fun job no matter which way you approach it. As I see it, there are three options:

1. Remove the dash and wire that up with it out of the car.
Advantages: Everything is visible, accessible and you can remove one wire at a time and reconnect the new or remove one item as needed to clean or repair anything else you find in need. Once the dash is wired there is one long nicely wrapped and easily handled bundle of wire to stick thru the hole in the firewall.
Disadvantages: The dash in itself is a project to remove. Unless you cut the old loom in two, all the wires in the engine side need to be disconnected so the wiring can pull thru the hole. It requires some disassembly, some molding removal and lots of mounting screws to be removed. For the best experience, a helper to assist in maneuvering the heavy and cumbersome assy to avoid scratching or accidental damage to anything else.

2. Remove the cluster and switch assy and pull those away from the dash so the wiring can be seen and connected more or less unobstructed.
Advantages: Only those two items need to come out.
Disadvantages: Removing the cluster can in itself be a project because the screws are not very visible or easily accessed. The still connected wiring may be wrapped around another component preventing either item from dropping far enough for full access and you still have to partially work under the dash. It can get confusing having a bulky new loom and a bulky old loom coexisting in the confined space.

3. Leave the dash and components in place and do all work under.
Advantages: There is less chance of damaging anything during removal and it can be done alone.
Disadvantages: It is extremely cramped and dark under the dash. For best access, at least the switch plate assy should be dropped down and, IMO the radio should be removed too. No matter what light you use it is never in the right spot and there are a lot of obstructions to work around. People with large hands or bodies may find it difficult to get under or to work in the confined space. No matter where you position yourself the steering column and pedals or a handle of some kind will be in the way. You still have the issue of old and new looms being worked on together.

I am anxious to hear what methods others have used. I have not done a 22-23 series dash but have rewired a 47, 54 and 56. On those I chose to remove the dash. If I were to leave the dash in I would at the least remove the front seat to be able to stretch out and get somewhat comfortable while laying on my back and reaching up. If not that then at least have a wide space to work in so you can have the doors wide open. You can make some sort of platform or cushioning to lay flat and at an angle extending out the drivers door or if that is not an option, making a cushion the same height as the hump and on both sides and working thru the passenger side. I can assure you that trying to cram yourself in between the seat and dash while laying on your back over the hump is not a fun experience.