Sooooo where to start.... I have known this truck for nearly 10 years through 2 owners both of which are close friends. It is a combo of a 79 chassis with an 84 cab. Currently building a flatbed on it and all sorts of other goodies including a full propane conversion. Conversion is finished and truck runs great. I will be putting together a write up for you mini truck guys as it was a stupid simple project I recommend to anyone looking to improve the efficiency and wheel-ability of any carbureted vehicle on a budget, must disclaim I am a fork lift tech with lots of propane experience though
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On to the questions I have for those in the know on the mini trucks. It has a 20R and I would like to know what the wiring schematic looks like for the alternator circuit. Currently I have confirmed that the alternator charges about 13 volts and drops at higher rpm (opposite of what I expected, maybe a regulator issue?) It is wired with a single positive wire hooked up to the green connector at back of alternator labeled IGN. There is a second terminal on same connector labeled N. Assuming that is for Negative(ground) but when connected it seems to make no difference to charging status. We have installed a 12k lb winch and require all the juice that little alternator will put out to the dual battery setup.
Secondly the factory coolant temp guage (84 cluster I believe) does not work. Wire from sender to guage good, guage does not respond to grounding out wire. Appears from what I can gather that the guage is missing battery positive to the other side of the guage, does anyone know how to confirm this or at least know the source of the voltage and is it supposed to be a 12 volt signal or does it use a resistor to run at something lower than 12volt.
Also anyone have a vacuum diagram handy for the vacuum advance, there are 2 vacuum lines and wondering where each go as all the emissions vacuum has been gutted and the previous owner (my buddy who doesn't remember where they went
) tore it all out like a tool without regard to things requiring it.
Lastly I would really like to get my hands on a FSM anyone know if there are digital copies floating around, I have one for my 80 though I rarely use it, in this case a FSM would answer every question I have... enjoy the weekend guys and for those of us in the Midwest enjoy a beer in the garage as the weather still blows
. On to the questions I have for those in the know on the mini trucks. It has a 20R and I would like to know what the wiring schematic looks like for the alternator circuit. Currently I have confirmed that the alternator charges about 13 volts and drops at higher rpm (opposite of what I expected, maybe a regulator issue?) It is wired with a single positive wire hooked up to the green connector at back of alternator labeled IGN. There is a second terminal on same connector labeled N. Assuming that is for Negative(ground) but when connected it seems to make no difference to charging status. We have installed a 12k lb winch and require all the juice that little alternator will put out to the dual battery setup.
Secondly the factory coolant temp guage (84 cluster I believe) does not work. Wire from sender to guage good, guage does not respond to grounding out wire. Appears from what I can gather that the guage is missing battery positive to the other side of the guage, does anyone know how to confirm this or at least know the source of the voltage and is it supposed to be a 12 volt signal or does it use a resistor to run at something lower than 12volt.
Also anyone have a vacuum diagram handy for the vacuum advance, there are 2 vacuum lines and wondering where each go as all the emissions vacuum has been gutted and the previous owner (my buddy who doesn't remember where they went
) tore it all out like a tool without regard to things requiring it.Lastly I would really like to get my hands on a FSM anyone know if there are digital copies floating around, I have one for my 80 though I rarely use it, in this case a FSM would answer every question I have... enjoy the weekend guys and for those of us in the Midwest enjoy a beer in the garage as the weather still blows
