Question about addressing electrical issues during engine out

Replace the fuse board, do not just do an update. GT Car Parts or guido's

 

The fuse blowing would indicate that circuit has shorted somewhere not in the board....guessing?

Horn button/ring, or maybe the air pump itself frozen

 

The fuse also powers the glovebox lights and glovebox power outlet. Make sure there isn't something plugged into the power outlet causing a short.

It's unlikely to be the horn button causing the blown fuse. The horn button is designed to provide a short to earth when you push it. That is, for the horn relay solenoid/coil.

You can almost eliminate the board as being faulty by disconnecting connectors K and B on the relay panel board and reinstalling the fuse. If the fuse doesn't blow, reinstall the plugs one at a time.

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Plug K provides power to the horn (output of the relay).
Plug B provides the earth signal from the horn button for the horn relay. Plug B also provides power to the glovebox.


Wiring diagram here:

https://www.dropbox.com/t/GU667eczlZTZYBoh

Link expires in 6 days.

 

I am sure D Helms is a good product for what it does. My personal opinion is that It still uses the old circuit board, which can and will delaminate over time. Much better to replace with a modern alternative. The new boards are plug and play and look orginal.

 

10 years ago I added a SRI gold connector kit over a number of evenings during a few months of down time. It was fun to install and the car ran better afterwards. Two engine out major later, my 91 still runs perfectly. Apparently the connectors in the engine bay get loose over time. Quite a few connector pins I removed had burn marks.

 

Look.. the laminated intagrated circuit board of the TR fuse panel is a complete peice of crap.

Now..moving on from that, there are a few circuits in the TR that can cause big heat issues. 1 is cooling fans, 2nd is fuel pumps, 3rd is the HVAC system. You must source out and repair all excessive current draw issues before just throwing parts at it. Old fans for example draw far more current then you would think.

There is also the fact that many of these circuits use under gauge wire which leads to excessive heat and resistance levels. All of these circumstances lead to melted connectors and burned out terminals.

 

Just take your time, do one wire at a time until each connector is refurbished and be patient, it will take a while. Everything you need to do the job is in the kit, you will be surprised how many corroded or loose connectors you will find.

 

probably GT Car Parts in Phoenix

 

Dennis, I feel pleased you mentioned my name. Doug already has the gold connecter kit to put on the wires. With my board he would have to change the connectors again, because the connectors I use are much bigger. Remember, the mean problem (other than the crappy layers) on those boards are the male connectors where the wires are put. Those are much to small for the current that passes. Also people use chemical products on the layers to prevent moisture. Instead of preventing, it disintegrates the layers.
Doug, succes with the installation !

 

Guido, your has worked flawless in my 512tr, the only reason I would choose Gt car's over your's is the stock appearance if that is important to a person. I can't speak to long term reliability.

 

My board has 13 years of service. And looks like it is put yesterday. So long term should'nt be a problem.