What resistor is need to drop volt?

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600rr

Member - Posts: 2

Joined: October 02, 2006

Location: United States

Posted: October 02, 2006 at 12:57 AM / IP Logged

I am trying to hook up my remote start on my 04 honda 600rr and the accessory wire (on the bike) need to see 8.5 volt to activate the fuel pump but the alarm is putting out 12.2 so what resistor do I need to use to drop the voltage? or what do I need to do?

thanks in advance

Ryan

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meh66

Copper - Posts: 266

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Joined: October 26, 2003

Location: United States

Posted: October 02, 2006 at 6:48 AM / IP Logged

You can use ohms law to figure out what resistance value you need, but you will have to find out how much current is going through the circuit. Ohm law is Voltage (V)= current(I) x resistance(R), so therefore (R) = V/I .You can find the current by meassuring it with a meter or maybe see how much current the accessory wire from the alarm is using. Example, if the current is 10 amps then you will need R = 8.5/10, therefore R = .85 ohms.

MEH66

"Car Performance and Mobile Electronic Enthusiats"

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meh66

Copper - Posts: 266

Joined: October 26, 2003

Location: United States

Posted: October 02, 2006 at 7:45 AM / IP Logged

Correction: I meant to say do you know how much current the fuel pump is drawing. I am thinking you can look at the pump itself or the fuse for the pump. I was curious as to how much voltage is the battery?

MEH66

"Car Performance and Mobile Electronic Enthusiats"

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kaezoo

Copper - Posts: 125

Joined: April 26, 2005

Location: United States

Posted: October 02, 2006 at 8:52 PM / IP Logged

If the ignition switch has a 12v input and only 8.5 volts of output, then it seems like the resistor must be built into the switch. It should be possible to disconnect the battery then use an ohm meter to measure the resistance through the switch between the input and output wires.

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600rr

Member - Posts: 2

Joined: October 02, 2006

Location: United States

Posted: October 03, 2006 at 2:09 AM / IP Logged

I dont know why I didnt think about that but that sounds like the thing to do! I will have to do that in the next few days! thanks for the input guys!

Ryan

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kgerry

Platinum - Posts: 3,455

This member consistently provides reliable information

Joined: February 07, 2004

Location: Saskatchewan, Canada

Posted: October 03, 2006 at 3:32 PM / IP Logged

use an 8.5 volt + V Reg.... attach a heat sink for good measure and off you go....

Kevin Gerry

Certified Electronics Technician

MECP First Class Installer

Owner/Installer

Classic Car Audio

since 1979

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What resistor is need to drop volt?

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