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Jun 18, 2017 11:08 am
Jun 18, 2017 11:08 am
Subject: Re: LG 45 wiper motor amperage/wattage
Hi Bill,
Hopefully your charging test will reveal that your voltage regulator needs adjusting down to a lower voltage.
Another possibility may be that internal insulation has broken down in the wiper motor leading to a partial short circuit. I do have a Berkshire motor in pieces, but annoyingly both my multimeters are playing up, otherwise I could have given you resistance readings for the field coils and armature. It does look like the field coils have 4 connections, so you could do a basic test to compare the resistance of each.
With those disconnected from the brush terminals, you could then connect an ohmmeter to those terminals; slowly rotate the armature...then that should show steady resistance readings. Also worth checking in both cases for shorting to the iron cores.
Wiper cables and wheelboxes are never included in service schedules, a major reason for them quite possibly never having been re-lubricated since new. The ancient grease congeals and undoubtedly then gives more resistance to movement than would be the case if the components had no lubrication at all. There is a remote possibility that your replacement cable is more efficient than a new Berkshire one, but I doubt that would result in a seriously higher wiper speed resulting.
Laurence
Hi Bill,
Hopefully your charging test will reveal that your voltage regulator needs adjusting down to a lower voltage.
Another possibility may be that internal insulation has broken down in the wiper motor leading to a partial short circuit. I do have a Berkshire motor in pieces, but annoyingly both my multimeters are playing up, otherwise I could have given you resistance readings for the field coils and armature. It does look like the field coils have 4 connections, so you could do a basic test to compare the resistance of each.
With those disconnected from the brush terminals, you could then connect an ohmmeter to those terminals; slowly rotate the armature...then that should show steady resistance readings. Also worth checking in both cases for shorting to the iron cores.
Wiper cables and wheelboxes are never included in service schedules, a major reason for them quite possibly never having been re-lubricated since new. The ancient grease congeals and undoubtedly then gives more resistance to movement than would be the case if the components had no lubrication at all. There is a remote possibility that your replacement cable is more efficient than a new Berkshire one, but I doubt that would result in a seriously higher wiper speed resulting.
Laurence