Since there is a distinct lack of information out there on the Doug Nash Enterprises Dual Range, or DNE2, I'm going to try to put everything I have gleaned on them in one place.
And document reviving this one that I got from SuperBuickGuy "recently" .
These 2 terminals connect to the reversible 12v motor by means of a neat limiting switch.
Ground is through the case and one terminal is 12v positive for high range and the other is 12v positive for low range. After last nights diagnosis session I'm not positive which is which, but I will figure that out later and post the info.
I was unable to get any sign of life by hooking my jumper pack directly to the terminals, so the cover came off. I then bypassed the switch, same thing, nada.
So I pulled the motor. You can see it here as the thing on the upper right with the triangle-ish 3-bolt cover. Slides right out after removing the limiting switch, just mind the wires so they don't get caught on the way out.
This is just a picture of the other end, which bolts onto the transmission (a TH400 in this case) in place of the tailshaft housing.
In my case, all of the electrical connections were covered with a semi-hard black coating. I suspect this is a deposit from the gear oil that splash-lubricates the engagement mechanism?
In any case, some time spent cleaning terminals with a bit of fine sandpaper and the motor roared to life. Both directions even. I'm betting it has been quite a while since it has been actuated as it took several seconds to reach full RPM, but after that it performed perfectly.
Bolted it back together and tried the external terminals, nothing. Rats.....pull it back apart and start cleaning the limit switch.
The sandpaper is being used on the pivots to try to get good contact in that area. You can see how the switch slides back and forth? The contact areas there are relatively easy to clean, but following the electrical pathway shows that the pivots likely are gunked up as well. They have tiny wavy washers in them to keep things snug, so I snuck the sandpaper in there and did my best.
Compare the semi-clean left pivot to the still dirty right one. The contact areas are both cleaned in this picture, but note the area in the notch of the slide (activated by a pin on the sector gear). That lumpy looking blackness is the deposit, I can't get in there and it is not really necessary to clean it at this point.
In this picture the left contact is closed and the right one is open. When the pin on the gear moves all the way to the left, it will cause the left contact to open and will close the right contact. Neat how it stops the motor from overrunning and also readies the circuit for the next shift.
Apparently cleaning switches is Dog-Speak for "I want to play with the squeaky"? I settled for cleaning the switch, reassembly can wait until after fetch wears the dog out.
One of the motor retention screws was badly bent, so I'm picking up a replacement today. I'm fairly certain the switch is fine now, will reassemble and test tonight.
And document reviving this one that I got from SuperBuickGuy "recently" .
These 2 terminals connect to the reversible 12v motor by means of a neat limiting switch.
Ground is through the case and one terminal is 12v positive for high range and the other is 12v positive for low range. After last nights diagnosis session I'm not positive which is which, but I will figure that out later and post the info.
I was unable to get any sign of life by hooking my jumper pack directly to the terminals, so the cover came off. I then bypassed the switch, same thing, nada.
So I pulled the motor. You can see it here as the thing on the upper right with the triangle-ish 3-bolt cover. Slides right out after removing the limiting switch, just mind the wires so they don't get caught on the way out.
This is just a picture of the other end, which bolts onto the transmission (a TH400 in this case) in place of the tailshaft housing.
In my case, all of the electrical connections were covered with a semi-hard black coating. I suspect this is a deposit from the gear oil that splash-lubricates the engagement mechanism?
In any case, some time spent cleaning terminals with a bit of fine sandpaper and the motor roared to life. Both directions even. I'm betting it has been quite a while since it has been actuated as it took several seconds to reach full RPM, but after that it performed perfectly.
Bolted it back together and tried the external terminals, nothing. Rats.....pull it back apart and start cleaning the limit switch.
The sandpaper is being used on the pivots to try to get good contact in that area. You can see how the switch slides back and forth? The contact areas there are relatively easy to clean, but following the electrical pathway shows that the pivots likely are gunked up as well. They have tiny wavy washers in them to keep things snug, so I snuck the sandpaper in there and did my best.
Compare the semi-clean left pivot to the still dirty right one. The contact areas are both cleaned in this picture, but note the area in the notch of the slide (activated by a pin on the sector gear). That lumpy looking blackness is the deposit, I can't get in there and it is not really necessary to clean it at this point.
In this picture the left contact is closed and the right one is open. When the pin on the gear moves all the way to the left, it will cause the left contact to open and will close the right contact. Neat how it stops the motor from overrunning and also readies the circuit for the next shift.
Apparently cleaning switches is Dog-Speak for "I want to play with the squeaky"? I settled for cleaning the switch, reassembly can wait until after fetch wears the dog out.
One of the motor retention screws was badly bent, so I'm picking up a replacement today. I'm fairly certain the switch is fine now, will reassemble and test tonight.
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