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if you are talking alternator regulator then find the existing unit and change it out with a new unit. Some alternators have the regulator as part of the brush set in the back of the alternator. With an income earning vehicle ,although it may be expensive to take it to an accredited truck auto electrician the cost of the job will be far less than the income earned by getting the vehicle back on the road in the shortest possible time.
I seem to remember that there was a relay for the fuel pump. Remover the wires from the fuel pump. Install a lower rating fuse and see if it. Lows. If it does the. There is a problem with the fuel pump relay or you have a short circuit in your wiring. The. You will. Red a diagram to chase that down. Note rays tend to go open circuit on the co instead of shorting out. If the fuse that is. Lowing is on the power side of the relay whe. The pump is disconnected the. You have a wiring short. If it does not blow with the pump disconnected, it is your pump getting ready to go to the big tank in the sky. Good luck
You need to check your engine wiring harness. 84 is part of the crumbling, corroding wiring insulation years. If your harness has not been replaced, you may have to really scrounge around to find one of the "new" versions that has okay insulation on the wiring.
use a probe light and check the connectors on the back of the iginition switch first ,hold key in start position and check for a feed from switch.then if you have a feed work your way back to motor and check relay
When you place key into the ignition and turn to "on" position, do you see your alt. light come on? If not, this is the cause of the charging problem. The current has to flow through this light and back to battery to complete the circuit.