Before I start my question on my head light motor…
I sincerely want to thank the many contributors to this web site and the NCRS web. I have learned a lot by reading through the many threads but I can't figure out what is wrong with the motor. Hurricane came blowing in to Houston Monday and the garage temperature was in the mid 70’s not the normal 90+ perfect conditions to attack the Corvette.

It's a 65 Silver Pearl air coupe HJ motor, I've owned since early 80's had under car cover in the garage for the last 27+ years after it was stripped and painted w/ almost 2 gal lacquer and clear coated. I took the car cover off and started working on it about 2 years back...Mike will be asking for photo's....coming later...

I have separated the gear assembly from the electrical motor so it’s not a “mechanical issue”

My problem with the motor on the bench using DC power source the motor only will run in the up direction vertical leg of the T (which would be the yellow wire on the RH female plug) runs with 6-8 amps current draw

When connecting the DC power source to the horizontal leg of the T down direction (which would be the green wire on the motor wiring harness) it pegs the battery charger with high current draw.

My first thought was internal wiring problem in the motor and the male connector was shorted out (disassemble and cut welds with a dermal tool)

I've ohmed out both legs of the male connectors to the ground screw and they both are about 2 ohms.

I’m stumped on why the motor runs in up direction and high current draw in the down direction.

 

I recently rebuilt mine and found the article on the NCRS website, attached below.

Couple of things to check.

The armature end play adjustment needs to be fairly loose.
The bushes aren't so worn out, that the armature binds in one direction ?
The commutator is cleaned and the segments are undercut.
The solder joints are still good, the brushes and springs are still useable.
I found new brushes (but had to make them fit) on Esty of all places.
I used alligator clips and a car battery for testing as my battery charger only supplied 2 amps.
Similar issue, would run one way but not the other.
If all this checks out, you may have a bad field winding or bad armature.
Hope that’s of some help
cheers

 

Great article, thanks for sharing!

OP, I think this rebuild is next for you. You will be surprised how much corrosion you will find in the motor assembly.

 

That was a fantastic article, and it's on my short list of todos.

 

I cleaned the armature, brushes, and spindle shaft with fine emery cloth. Lightly greased the spindle and reassembled the motor. The motor now runs in the down direction (right motor horizontal part the T wire connection-green wire) but I had to give a slight hand twist to get it started. Put the motor and gear box assembly together. Slacked off on the pre-load adjustment. Motor runs fine in the up-direction, still need to give it a bump start in the down direction of rotation. Currnet draw in the up direction about 4.5 amps, in the down direction 5.5 to 6 amps ( 1 to 1.5 amps more)
Need to let the motor cool off - thermal switch was stopping it (had been running the motor in in each direction for a while). I may put a few drops of TRi-Flow on the spindle shaft. I'll mess with it again tomrrow

AnyChev -I had copies of the C2 head light pdf, thanks for posting it for others...

 

Carefully run a sharp blade in between the armature commutator segments, it’s possible it’s clogged with debris from 50 year old brushes.

Also check the brush holders aren’t loose on the board, contributing to some interference.

These things are fiddly and frustrating for older guys (like me) with poor eyesight and no patience.

Don’t give up, you’re close to success
good luck

 

AnyChey
I did that when I pulled the motor assembly out. On reassembly one of the two motor long screws that connect the motor to the gear drive will not tighten correctly
I think there is a possible armature offset to the center line... will look at correcting the female damaged threads on the gear box assembly and maybe this will put the motor in the C/Lof the shaft axis and minimize possible non-concetric motor axis on the field windings. Will get back on up date after the weekend
thanks again for your communications..