Honda CX 500 Forum banner
1 - 7 of 7 Posts

·
Registered
1985 Gl400
Joined
·
4 Posts
Discussion Starter · #1 ·
hows it im checking the ti system on my 85 gl, just need to clarify a picture or two

with the key off, ground of DMM too negative terminal of battery it reads 000.0

with the key on it reads 005.4mV

is this an earth fault or is it to be expected?

i guess what im asking is should the frame read a mV reading normaly ?

main fuse is 12.5 as are the ignition modules on the black\white wire and around the same reading +\-
 

·
Super Moderator
Joined
·
5,218 Posts
Where is your positive lead? At the battery positive? Somewhere else?
 

·
Registered
1982 Honda CX 500
Joined
·
1 Posts
hows it im checking the ti system on my 85 gl, just need to clarify a picture or two

with the key off, ground of DMM too negative terminal of battery it reads 000.0

with the key on it reads 005.4mV

is this an earth fault or is it to be expected?

i guess what im asking is should the frame read a mV reading normaly ?

main fuse is 12.5 as are the ignition modules on the black\white wire and around the same reading +\-
 

·
Registered
1985 Gl400
Joined
·
4 Posts
Discussion Starter · #4 ·
Where is your positive lead? At the battery positive? Somewhere else?
battery leads are slightly looese as im using short jump leads and a bigger battery clamped conections etc not loose in connection or touching, suitable battery, ive got the negative probe for the dmm to the neg of the battery, poitive to bare metal on frame (earth point), when the key is off its reading 0000 when the key is on i get a current reading, is that indicating a short somewhere maybe? or am i reading and doing things wrong?
 

·
Registered
1985 Gl400
Joined
·
4 Posts
Discussion Starter · #5 ·
battery leads are slightly looese as im using short jump leads and a bigger battery clamped conections etc not loose in connection or touching, suitable battery, ive got the negative probe for the dmm to the neg of the battery, poitive to bare metal on frame (earth point), when the key is off its reading 0000 when the key is on i get a current reading, is that indicating a short somewhere maybe? or am i reading and doing things wrong?
batery reads 12.8v
 

·
Super Moderator
'84 CX650E that is evolving into a GL500
Joined
·
17,466 Posts
The negative terminal of the battery is supposed to be connected to ground but it isn't uncommon for resistance in the circuit to cause a tiny voltage to develop at the connections. I wouldn't be terribly concerned about anything less than 100 Mv.

BTW: Voltage is not a "current reading". Voltage is the electrical equivalent of pressure and current is the rate of flow of electricity through a load.

Before you try to measure anything with your meter it is a good idea to learn how meters do what they do and how to use them. I strongly recommend studying this page about the various types of meter (voltmeter, ammeter, ohmmeter) and then moving on to the section on multimeters linked at the bottom of the page to learn about how to use a meter that combines the types in one case

If you are unfamiliar with things electrical it is probably a good idea to go through their page on how series and parallel circuits work, followed by the section on voltage & current linked at the bottom.
 

·
Registered
CX500B 1979 and 2004 BMW F650GS
Joined
·
83 Posts
Sounds like you're doing a voltage drop test. But to get that/any reading, surely your bike positive is connected to the battery positive?

As Bob says, 5mV is not to be concerned about... Now... 5 volts on the other hand :)
 
1 - 7 of 7 Posts
Top