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Terry Syd · 03-08-2008

I looked at the price of various rheostats (potentiometers, variable resistors) and the prices for a 10 amp device was way too expensive.

Since I want a simple two voltage system, then a STDP switch using a resistor in one circuit seems more logical and less expensive. The pump windings measured 2 ohms. If I use a .5 ohm resistor in series with the line voltage, then I will have a 20% drop in voltage across the pump.

I tried a .47 ohm resistor in the line and it worked fine. I'll be wiring in a double pole switch so that one circuit is the alternator voltage to the pump and the other circuit is alternator minus around 20% (depending upon what works best).

If someone has a simple basic system for their vehicle that they want to fine tune, then a resistor in the line to the pump can help them fine tune the pump pressure. A person could use a .1, .22, or a .47 ohm resistor. If they wanted they could put a couple in series, say a .1 and a .22 and come up with a .32 resistance (or put a couple of 1 ohm resistors in parallel to come up with a .5 ohm resistance).

03-08-2008	#8 (permalink)
Terry Syd Alcohol Holic Join Date: Nov 2007 Posts: 104	Re: Pump adjustment screw I looked at the price of various rheostats (potentiometers, variable resistors) and the prices for a 10 amp device was way too expensive. Since I want a simple two voltage system, then a STDP switch using a resistor in one circuit seems more logical and less expensive. The pump windings measured 2 ohms. If I use a .5 ohm resistor in series with the line voltage, then I will have a 20% drop in voltage across the pump. I tried a .47 ohm resistor in the line and it worked fine. I'll be wiring in a double pole switch so that one circuit is the alternator voltage to the pump and the other circuit is alternator minus around 20% (depending upon what works best). If someone has a simple basic system for their vehicle that they want to fine tune, then a resistor in the line to the pump can help them fine tune the pump pressure. A person could use a .1, .22, or a .47 ohm resistor. If they wanted they could put a couple in series, say a .1 and a .22 and come up with a .32 resistance (or put a couple of 1 ohm resistors in parallel to come up with a .5 ohm resistance).