I thought this may be helpful to someone.
To bypass the accumulator switch and run the compressor at 100%, simply remove the disconnect from the accumulator, crimp two male elec connector guys on a short piece of wire, and insert. This bypasses the accumulator switch and runs the compressor without cycling. This can help to troubleshoot or stabilize pressure to fill a system too low on refrigerant for the compressor to engage aka short cycling.
I don't get it, why would you need to bypass the accumulator to put more refrig. into the system. I thought the accumulators only job was to store possible water vapor that sometimes gets into the system...
If the a/c system is too low on refrigerant, the compressor will short-cycle (turn on and off every several seconds) or possibly not turn on at all. How exactly this works, I have no idea, but using the jumper to bypass the accumulator switch will run the compressor (the compressor clutch) at 100% so a reading can be made from the low side schrader valve.
ok thanks for the new info, i just got done replacing my a/c compressor, accumulator, a/c condenser, radiator, clutch fan, water pump(a few times) etc etc...And the air works pretty darn good for a 13 year old. Not great but very good.. The only parts I really will need to replace one day our the ones under the dash (help me out here I'm having a brain cramp, can't remember there names) anyway I have alldata for that..and I'm not looking forward to replacing them (under the dash and all, need to remove a lot of stuff), but I know thats the only way to bring the system back to like new, next time I have that clutch problem I'll give your trick a try, because I have no fear of such things...it's air on, or new car..so I choose to repair repair repair..
Just used this trick, and it didn't work, at first. Apparently, my clutch had become a bit sticky.
I did notice that when I jumpered the compressor clutch too, it would pull in a wee bit, but not nearly enough to drive the compressor. I poked it with a stick while the engine was running and it engaged right away, but it would not turn on again by itself.
Then I maced it with some spray lube, and it seems to be working OK. I hope that just using the recharged system will get it engaging reliably again.
So, point is, thanks for the tip about the accumulator bypass, it got me going again too!