Quote:
Originally Posted by rfmaster
Mike
Regarding AC control relays and circuit.
AC control circuit will require some rework. I have a FSM for '91 B-body which covers AC circuit in detail. I do not have the same manual for your truck! If you can get your truck information than we have a good chance of putting a combo harness that will work.
Regarding speedometer.
Bad news - money involved. To get a fully functional spedo - VSS will require procurement of two parts. You have to get a mechanical speedometer driven gear housing - that's what plugs into transmission in place of your electronic vehicle speed sensor (VSS) from an earlier 700R4 equipped car or truck from JY or a local tranny shop. Try to get aluminum one - they last longer. Depending on tire/rear end ratio you'll have to change driven gear to get speedometer to read correct speed. Furthermore, to keep ECM happy an inline bolt-in VSS from JTR will have to be procured. TBI equipped cars and trucks used two-pulse (2000 pulses per mile) square wave VSS (it's a reed switch) through 1992. You can read a full explanation here:
http://www.jtrpublishing.com/Pages/S...eedometer.html
A lower cost VSS is available from Summit made Rostra Precision Controls 250-4153
http://www.summitracing.com/parts/RPC-250-4153/
Specs for this part - number of pulses per revolution are not available. I did not use this part before so I have no first hand experience. Perhaps, worth a call to summit tech line.
Another rely cheap inline VSS is made by SCS/Frigette 208-3606 - again no first hand experience with this one.
More discussion with VSS retrofitting can be found here:
http://www.binderplanet.com/forums/s...ad.php?t=50649
//RF |
RF,
I am wondering if I tie truck A/C control wire(s) into the circuit that goes to the ecm for the a/c would that then control the relay to fire the a/c? What info about the truck is required to construct the harness you are talking about? Do you do this type of work? I am assuming you are a EE....is it just a hobby?
Regarding the VSS, it looks like this with the proper gear ratio and tire size would be a direct replacement:
It is pretty pricey at a $101 plus the shipping. I wonder if any of the early 90s
burb or blazer instrument panel with necessary wiring would solve the speedo issue? As always, thanks for the help!
Mike