SI to CS Conversion

[19brownie92]

Long time lurker first time poster.
I have spent days looking and reading posts here and other places on alternator conversions. Here is the short version. I need help.
1972 c-10 350 sb.
A couple of years ago I did the conversion to an 85 or so amp SI alternator.
I used a commercially available "kit" basically a jumper for the old voltage regulator and a new alt. plug. everything has been fine since then. I have since done an engine upgrade and added a EFI and dual electric fans. The current Alt. could not keep up. I got a CS144 250 amp Alt. to replace it. It is only putting out 13 volts. I was thinking it should be around 14.2ish
I have run all new 6ga wire directly to the batt. and have a direct ground to the case.
I have used the diagrams that I have found on the forums to make sure the wiring is correct, but something still seems amiss.


I have placed the jumpers on the old regulator plug
BlK to WHT
Red to Blue


The Blue wire then connects to the L terminal on the alt via the resistor
The White wire connects to the S terminal on the alt.


Im sure Im missing something simple. My truck does not have an"indicator lamp" it have a voltage gauge. So I was thinking that I DO need the resistor> please correct me if I am wrong.
Thanks
I tried adding pictures, but I haven't figured that out yet either