With the batteries connected in parallel, they cannot have different
voltages (axiomatic- they are connected by a very low resistance wire,
and current will flow as needed to keep them at the same voltage). The
relay can't be triggered by a difference between the batteries. This
description makes me think very strongly that it is a voltage sensitive
relay, dropping out at about 10 volts, which could not be replaced by a
'standard' relay like the one you have.
Glen Hadley
On 3/15/2013 14:37, Bert Knupp wrote:
Battery isolation relay
As described in the factory's shop bulletin, the relay is /actually/
supposed to open the circuit only when the potential between battery
#1 and ground drops below 10.0 volts, but keep them connected in
parallel so long as both battery #1 and battery #2 hold 10 volts or
better. In other words, the relay is "triggered" by having a (pos+)
feed to both coil terminals, one from each battery. If one battery
begins to run down, it creates a difference in potential (voltage)
between the two batteries, opening the relay so #2 gets cut loose in
order to stop it from running down #1.
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