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Old 04-23-2013, 07:15 AM   #1
Spinalcracker OP
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GPS canbus plug

I want to hard wire my garmin gps to the canbus gps plug. I have the plug but I don't know which wire for positive and ground.

Any Ideas ?



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Old 04-23-2013, 08:36 AM   #2
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Grab a multimeter, plug the connector in and test the voltage on the bare wires?
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Old 04-23-2013, 08:48 AM   #3
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Quote:
Originally Posted by epicxcrider View Post
Grab a multimeter, plug the connector in and test the voltage on the bare wires?
OK so that will tell me the positive wire right. What if the other don't have power how do I know which is the ground?
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Old 04-23-2013, 09:05 AM   #4
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Allright boys schools in session:

Multimeters do not measure Voltage as you commonly know it, it measures DIFFERENCE IN POTENTIAL.

So, Set your MM up to measure Volts DC: should be labeled or look like a solid line with dotted line under it.

Set it to Volts or Auto ranging, not mV or uV (micro volts)

Plug the black into COM and the Red into V

Now this is where you need to pay attention. In order to read "Volts" (whoch is actally difference in potential), take the leads and stick them into the holes, doesnt matter which one into which.

If it reads +12v then that means that the holes that the red lead is in is positive wire and the black lead is plugged into the common wire, usually referred to as ground.

If it reads -12v, this means that the wire that the red lead is in is the COM (Ground), and the black lead is plugged into the Positive wire.

If you have a 2 wire system, you are done! Label them and move onto to tapping into the wires for your GPS power.

3 WIRES: Not hard, just a little math here. Basically do the same, but what you are looking for is a combination of two of the three wires that gets you a hard 12V. Plug and play until you get it. Remeber to look at the MM readout for + or - as this will tell you what polarity you have based on how you have the leads plugged in.
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Old 04-23-2013, 09:38 AM   #5
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Quote:
Originally Posted by lanceputnam View Post
Allright boys schools in session:

Multimeters do not measure Voltage as you commonly know it, it measures DIFFERENCE IN POTENTIAL.

So, Set your MM up to measure Volts DC: should be labeled or look like a solid line with dotted line under it.

Set it to Volts or Auto ranging, not mV or uV (micro volts)

Plug the black into COM and the Red into V

Now this is where you need to pay attention. In order to read "Volts" (whoch is actally difference in potential), take the leads and stick them into the holes, doesnt matter which one into which.

If it reads +12v then that means that the holes that the red lead is in is positive wire and the black lead is plugged into the common wire, usually referred to as ground.

If it reads -12v, this means that the wire that the red lead is in is the COM (Ground), and the black lead is plugged into the Positive wire.

If you have a 2 wire system, you are done! Label them and move onto to tapping into the wires for your GPS power.

3 WIRES: Not hard, just a little math here. Basically do the same, but what you are looking for is a combination of two of the three wires that gets you a hard 12V. Plug and play until you get it. Remeber to look at the MM readout for + or - as this will tell you what polarity you have based on how you have the leads plugged in.

Ok great I'm learning

So this is the meter I use. So the red goes in the Com lower and the black would go in the one above it. I would set the dial to the DCV section and on the 20

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Old 04-23-2013, 09:42 AM   #6
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no. black goes in the COM; COM is the ground.and the red would go in the middle connector. and then set it to DCV 20
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Old 04-23-2013, 09:59 AM   #7
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Quote:
Originally Posted by lanceputnam View Post
Allright boys schools in session:

Multimeters do not measure Voltage as you commonly know it, it measures DIFFERENCE IN POTENTIAL.

So, Set your MM up to measure Volts DC.
Set it up to measure what now?
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Old 04-23-2013, 10:08 AM   #8
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Quote:
Originally Posted by kingnba6 View Post
no. black goes in the COM; COM is the ground.and the red would go in the middle connector. and then set it to DCV 20
ok got it
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Old 04-23-2013, 10:26 AM   #9
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The yellow wires are numbered

The wires are numbered: #1 is ground, #3 is switched 12V.

Ignore #2 - just insulate the end and put it aside.

mike
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Old 04-23-2013, 10:58 AM   #10
lanceputnam
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Quote:
Originally Posted by epicxcrider View Post
Set it up to measure what now?

Haha. Good catch. I figured he had one of the mass produced MM's that says "Volts" on it.
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Old 04-23-2013, 11:49 AM   #11
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Quote:
Originally Posted by bmwroadsterca View Post
The wires are numbered: #1 is ground, #3 is switched 12V.

Ignore #2 - just insulate the end and put it aside.

mike
what he said
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Old 04-23-2013, 01:13 PM   #12
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Quote:
Originally Posted by bmwroadsterca View Post
The wires are numbered: #1 is ground, #3 is switched 12V.

Ignore #2 - just insulate the end and put it aside.

mike
even better thanks
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