71autoxr
Well-Known Member
I have a restored 1969 dart with factory a/c. The blower started working in default single speed (high). While tackling another repair that required the dash out, i decided to tend to the issue. Diagnosis determined the blower motor was causing too much resistance on the system, causing the blower resistor to essentially burn up.
The purpose of this post is to give information for a reasonable replacement for the unobtanium original part. 2837805
Disclaimer I’m not a rocket doctor, but my neighbor that assisted in the diagnosis and testing is.
the original resistor is a 4 wire (3 male spade/single spade). and While I have found some NOS for well over $100, i opted to try NAPA Part #: ECH BR430 ($10). The part is visually different, smaller board, and only 3 male spades in a different pattern, meaning it is NOT a simple bolt in.
I was able to successfully get the napa part to work with a very small amount of work.
solder a short section of wire to the appropriate terminal on the new part that lacks the male spade terminal where you need it. use a male spade on the open end.
fabricate 3 similar length sections of wire with female spade terminals that fit on the new part, AND male spade terminals that fit into your female harness plug.
What I did was to cut a rectangular hole in the original resistor (Dremel and small cut off wheel) and riven the new plate into it so it does return to an original bolt in. It is not pretty, but it is also not visible.
You now have a functional blower resistor that will return your 3 speeds (assuming you remedied the initial cause - typically the resistor will not blow on its own - check the blower motor first).
I did attempt to move the individual resistors to the old board with no success.
You’re welcome
https://www.napaonline.com/en/p/ECH...kWDMKK0HAFlFKh3i0hoCPYwQAvD_BwE&gclsrc=aw.ds&
The purpose of this post is to give information for a reasonable replacement for the unobtanium original part. 2837805
Disclaimer I’m not a rocket doctor, but my neighbor that assisted in the diagnosis and testing is.
the original resistor is a 4 wire (3 male spade/single spade). and While I have found some NOS for well over $100, i opted to try NAPA Part #: ECH BR430 ($10). The part is visually different, smaller board, and only 3 male spades in a different pattern, meaning it is NOT a simple bolt in.
I was able to successfully get the napa part to work with a very small amount of work.
solder a short section of wire to the appropriate terminal on the new part that lacks the male spade terminal where you need it. use a male spade on the open end.
fabricate 3 similar length sections of wire with female spade terminals that fit on the new part, AND male spade terminals that fit into your female harness plug.
What I did was to cut a rectangular hole in the original resistor (Dremel and small cut off wheel) and riven the new plate into it so it does return to an original bolt in. It is not pretty, but it is also not visible.
You now have a functional blower resistor that will return your 3 speeds (assuming you remedied the initial cause - typically the resistor will not blow on its own - check the blower motor first).
I did attempt to move the individual resistors to the old board with no success.
You’re welcome
https://www.napaonline.com/en/p/ECH...kWDMKK0HAFlFKh3i0hoCPYwQAvD_BwE&gclsrc=aw.ds&
...if you're that much of a purist. I'm not.
