fuse blows when probing the wire

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geepherder

Platinum - Posts: 3,668

This member consistently provides reliable information

Joined: October 27, 2003

Posted: April 06, 2005 at 8:24 PM / IP Logged

Yes, you'll see a change. You didn't say what year, make and model vehicle you have. Probably the most common setup uses negative triggers, so you'll have 12v at rest, and it'll drop off when you hit the locks. Some vehicles, however, like Chryslers use one wire for door locks, and you trigger the ground through a set value resistor for lock, and another value for unlock.

My ex once told me I have a perfect face for radio.

nava94

Silver - Posts: 296

Joined: February 28, 2004

Location: United States

Posted: April 06, 2005 at 8:52 PM / IP Logged

get yourself a digital multimeter it will save you the headaches and tears.much safer too.

rock1

Copper - Posts: 120

Joined: April 06, 2005

Posted: April 06, 2005 at 10:07 PM / IP Logged

I have a voltimeter but dont know how to really use it.

im use to the probe light. its a 92 mazda 929

I want to probe the lock wires with the voltimeter how to use it

geepherder

Platinum - Posts: 3,668

Joined: October 27, 2003

Posted: April 07, 2005 at 7:29 AM / IP Logged

Set the meter to voltage, touch black to a ground (cigarette lighter rim), touch red to your suspect wire.

My ex once told me I have a perfect face for radio.

overworked2

Copper - Posts: 132

Joined: March 10, 2005

Location: United States

Posted: April 07, 2005 at 9:18 AM / IP Logged

Patience is a virtue geepherder, I appluad you.

Check all advice given with a meter

rock1

Copper - Posts: 120

Joined: April 06, 2005

Posted: April 07, 2005 at 10:22 AM / IP Logged

I have trhe actron cp7672 model

DMM

Set it on DCV and what number to test wires for alarm setup. there is 20 200m ect on that model.

geepherder

Platinum - Posts: 3,668

Joined: October 27, 2003

Posted: April 07, 2005 at 8:26 PM / IP Logged

You want to use the level above what you expect to measure. That would be the 20 volt setting.

My ex once told me I have a perfect face for radio.

rock1

Copper - Posts: 120

Joined: April 06, 2005

Posted: April 07, 2005 at 9:27 PM / IP Logged

ok I set it on DCV 20 and just probe the wire. Now the the wiring chart says the alarm locks are a negative type. so I probe the wire using the red lead and what should I see on the multimeter to know its correct?

geepherder

Platinum - Posts: 3,668

Joined: October 27, 2003

Posted: April 08, 2005 at 7:19 AM / IP Logged

If it shows 12v normally, it'll drop off to 0 when you press the button. If it doesn't show 12v at rest, set your meter to resistance (a low setting), and measure resistance to ground. When you press the button, you'll have a low resistance reading.

My ex once told me I have a perfect face for radio.

rock1

Copper - Posts: 120

Joined: April 06, 2005

Posted: April 08, 2005 at 12:19 PM / IP Logged

I checked the alarm wiring chart and it shows the doors are negative. so with the DMM all I just have to do is put the black lead to ground and red to the wire im testing. is that for any wires im testing? unlike the probe light to test a negative you have to clip the red end to 12v and then probe. and to test a postive I clip to a ground

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