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One Less Harley 02-07-2009 09:10 AM

Conecting volt meter to G/S
I'm connecting a stock volt meter to my 84 G/S, and need to know what color wire to connect it to.

In the volt meter- I've got a brown wire, grey and white (ground and gauge light), these are no problem, but I have a red wire which goes to the needle which I don't know what to connect it to in the headlight nacelle. I can't connect it to the red wire which goes to the ignition switch because that is constantly hot.

So where do I need to splice into??


Caddy82rats 02-07-2009 12:32 PM

You have only to find a + after ignation switched on
You can hotwire one from the ignation switch (Tist wich one with the volt meter)

bpeckm 02-07-2009 03:43 PM

I don't know the particulars of your bike, but IF you are picking up grounds and so forth inside the headlight, I would be tempted to run the "Hot" for the VM to the bulb feed itself (assuming that the headlight is "on" when the ignition is on!), other wise, as said above, find any positive that is turned on when the switch is on. You could do this right at the switch with a little ingenuity etc.

FWIW, your voltmeter, if you are picking up voltage in the headlight bulb and not at the battery, will help in showing a "relative" voltage... i.e. it may in fact be lower than the battery voltage because of wire resistance etc, but you can still use the information to good advantage... if the voltage is lower than what you normally see, there is something going on. In other words, don't take the vm reading to be absolute gospel until you have compared it to the battery voltage, then you will know what the difference is.... it could easily by several tenths of a volt, or more, different.


One Less Harley 02-07-2009 03:57 PM

I ran the lead to a switched green wire off the ignition, and there is a voltage drop com paired to the battery voltage 12.75 at the battery vs about 11.5 at the ign switch.

Thanks for the info guys

bpeckm 02-07-2009 04:00 PM

Wow, that's a big drop.... maybe you can find a hot wire that has'nt been routed to Nebraska and back before you tapped into it....????


RecycledRS 02-07-2009 04:07 PM

Might be a good idea to find out where that volt drop is occurring. Could be a high resistance connection or the ignition switch itself.

jtwind 02-07-2009 04:14 PM

That bike should have a hook up for a volt meter already in the wiring harness. My g/s did. Look at a wiring diagram and you should be able to find it.

One Less Harley 02-07-2009 04:28 PM

That's 11.5 volts by the motometer volt meter, I should check it with a better piece of equipment.

I know G/S's had only a tach and clock so the volt meter wasn't offered. At least looking at the micro fiche. I could go directly to the battery, but I hate to add another wire to the battery.

There's a harness for the tach, but not anything else

RecycledRS 02-07-2009 04:37 PM

Try checking it while under load (head light on) both at the battery and after the switch. That should give you an idea of the voltage drop with some current flowing through the switch and wiring harness. Don't forget to check the ground connections (they tend to get loose or rust over time).

RandyB 02-07-2009 06:39 PM

Clean and protect all connections as well. That'll improve a number of things. Noalox.

One Less Harley 02-07-2009 07:14 PM

Silly me I checked the voltage at the battery w/o a load......... with ignition switch on, bike not running it was 12.2 volts at the battery, at the guage about 11.5-11.75.

All the connections are clean w/ dielectric grease.

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