seci high idle mod

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Mar 10, 2021 | 11:22 AM

daves2021

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seci high idle mod

hi everybody new to the forum. trying to do the high idle mod and and have not been able to get it to work and i was hoping to get some input what i could be doing wrong. i have #1 upfitter switch hooked up to the #7 pin yellow/green wire (pto1) in the passenger foot panel and i have a 20 k resistor between the #10 pin white/brown wire (diesel pto ref) and the #9 pin green wire (pto rpm). i started the truck put on the parking brake turned on the upfitter #1 switch and nothing. check voltage to the yellow/green from upfitter to passenger foot panel and have 14 volts. checked volts at white/brown and have 5 volts then checked green and it has 5 volts i don't think the green should have 5 volts on the other side of the resistor. double checked to make sure all the pins and wires were correct. thanks in advance . 2021 f-250 psd

Mar 10, 2021 | 01:45 PM

stryder

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From: SE Iowa

Double check you have the correct yellow/green. There are 2 wires in that bundle with the same color scheme and very easy to grab the wrong one.
The rest of your setup looks good.

Mar 10, 2021 | 02:14 PM

daves2021

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yes double checked. i have the yellow/green pin 7

Mar 11, 2021 | 04:58 PM

stryder

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From: SE Iowa

No doubting you at all, but did you follow the yellow/green #7 through the entire harness?
I asked only because there was another member who was having the same issue and just as adamant he had the correct wire. Until I mentioned there were 2 the same color. He retraced and found where they crossed and had wrong one. Very easy to do when in the tight quarters under the dash.

Mar 12, 2021 | 09:09 AM

daves2021

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stryder thanks for your help. pulled the 3 wires from the bundle to make sure i had the right ones hooked them back up still don't work. 14 volts y/g 5 volts wt/br 5 volts green.i thought i read somewhere i should have .971 volts on the green wire. could i be using the wrong resistor. 1/4 watt 20k 1%

Mar 12, 2021 | 09:55 AM

stryder

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From: SE Iowa

Likely wrong resistor. Yes it is 0.971V after the resistor using a 20k. The correct resistor is 1/2W 20k 5%....though I think a 1/4W will work too.

Mar 12, 2021 | 10:23 AM

daves2021

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thanks will get the resistor and try that. should it read 5volts on the wt/br side of the resistor and .971 on the green side of the resistor?

Mar 12, 2021 | 11:45 AM

stryder

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From: SE Iowa

Well I wasn't going to call you out by name Jim, but yes I thought of your struggle, lol. I did the same thing on mine, too. All good now though

Mar 12, 2021 | 08:09 PM

#10

encmerk

Cross-Country

Joined: Nov 2012

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From: Havelock, NC

I’m thinking of doing this mod, but I’ll add a potentiometer capable of going to 50k ohms so I could change the rpm any time necessary.

Mar 13, 2021 | 03:50 PM

#11

2020STX250

Mountain Pass

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From: Texas

See if this helps.

Mar 13, 2021 | 04:00 PM

#12

daves2021

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thanks, i have watch this and a few other vids, and i can't get it to work. ordered a 1watt 20k ohm resistor but don't know if that will change anything. i'll keep trying