N
Normk
Guest
Just a reminder, when you are doing any voltage drop test, the normal current needs to be flowing in the circuit. You are measuring the voltage required to cause the current to flow through the connection between the fuse and fuse clip. Since we don't want any work to be done in forcing current through that "circuit" there should be no voltage drop (no voltage lost).
For example, if checking the headlight fuse, have the key on and the headlight on high beam because that creates the largest load (most current/amps.)
If voltage is measured it means that we are doing work to cause current flow so heat will be produced there, both of which are not good. Any voltage lost there is subtracted from the total voltage available to cause current flow in that circuit. Ideally, we want to see all the voltage applied to the headlight but we can work to more specific tests.
Testing your fuses for voltage drop is both a good precaution against failures due to heating and good practice.
HIH
Norm
For example, if checking the headlight fuse, have the key on and the headlight on high beam because that creates the largest load (most current/amps.)
If voltage is measured it means that we are doing work to cause current flow so heat will be produced there, both of which are not good. Any voltage lost there is subtracted from the total voltage available to cause current flow in that circuit. Ideally, we want to see all the voltage applied to the headlight but we can work to more specific tests.
Testing your fuses for voltage drop is both a good precaution against failures due to heating and good practice.
HIH
Norm