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Re: Electrical experts please take a look [Re: Supercuda] #2197664
11/16/16 11:46 PM
11/16/16 11:46 PM
Joined: Jan 2003
Posts: 10,666
North Dakota
6PakBee Offline
I Live Here
6PakBee  Offline
I Live Here

Joined: Jan 2003
Posts: 10,666
North Dakota
I'm not sure just how you have your existing switch plumbed or wired but this is one example of a pressure switch with an adjustable deadband option that looks at first glance to be suitable.

http://www.ueonline.com/bulletins/j40-b.pdf


"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: Electrical experts please take a look [Re: Guitar Jones] #2198552
11/18/16 04:32 PM
11/18/16 04:32 PM
Joined: Jan 2003
Posts: 27,421
Balt. Md
3
383man Offline
Too Many Posts
383man  Offline
Too Many Posts
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Joined: Jan 2003
Posts: 27,421
Balt. Md
Looks like you guys have him fixed up with some very nice setups. This makes me remember when Mopar used a dampned pressure switch in the AC low side that controlled the comp as it would close at about 60 psi in the system and open about 28psi. This is good info you all helped him with. Ron

Re: Electrical experts please take a look [Re: 383man] #2216538
12/18/16 09:20 PM
12/18/16 09:20 PM
Joined: Dec 2009
Posts: 20,600
in a cattle trailer down by th...
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Guitar Jones Online laugh2 OP
Paddle faster! I hear banjo music!
Guitar Jones  Online laugh2 OP
Paddle faster! I hear banjo music!
G

Joined: Dec 2009
Posts: 20,600
in a cattle trailer down by th...
Yes they did Ron. I used Supercuda's second schematic, thank you again, but I added a second relay for the PCM ground and ran the grounds for both solenoids and the lockup relay to the second relay then used the original O/D ground to the PCM to trigger the second relay.

I did this for a couple reasons.

1.) So I don't get L/U until the trans is in O/D

2.) If you use a separate circuit for L/U the trans will not down shift once it is in L/U. Not good when you need to accelerate at 45 MPH and you are in O/D and L/U.

3.) I didn't want to chance burning out the driver in the PCM running three circuits through it. They aren't exactly available everywhere.

So it now works great, I get L/U at 44 MPH and it unlocks at 37 MPH. Almost like the truck came from the factory that way. If I didn't have the PCM controlled O/D I would have had to do something more complex but as it is now it's perfect. Thanks again!!


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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