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--- electrical:12v:alternator_charging_hvd [2017/10/11 14:26]
frater_secessus [how it works]
+++ electrical:12v:alternator_charging_hvd [2017/10/11 17:24]
frater_secessus [solenoids and relays] took out isolator sectoin
@@ Line 14: / Line 14: @@
 Shutting down the device will require different approaches, depending on where it gets the power to operate itself.
-===== disconnecting isolators and simple relays =====
+===== solenoids and relays =====
+{{ https://images-na.ssl-images-amazon.com/images/I/51tg8FDT67L._SX466_.jpg?200}}
+Purely Mechanical devices like solenoids and relays use 12v //trigger// or //exciter// voltage((usually from the accessory circuit)) to operate.  They will either have 4 lugs or 3 lugs;  in the latter case grounding is done through the base of the device.
-by 12v trigger.  Example:  12v source that's only active when the key is in the RUN position.  These have 4 lugs:  starting+, house+, trigger+, trigger-; or,
+Power to these devices is disrupted by interrupting power to the trigger+, which is one of the small lugs.((or the only small lug in the case of 3 lug relays))
+===== voltage sensing relays =====
-===== disconnecting voltage sensing relays =====
+Voltage sensing relays (VSR) typically take power from the chassis battery and have a thin ground to complete the circuit.
-These usually have 3 lugs:  starting+ in, house+ out, starting-.  The starting- "ground" is only used to complete a small circuit so the relay can run itself.  So it's usually very thin.
+Power to VSRs is disrupted by cutting the ground wire. One way to reestablish the ground (thereby turning the device on) is HVD --> relay NO contacts --> ground wire in/out
+===== solid state isolators =====
+Some solid state isolators have a trigger or exciter input;  drive with HVD as with solenoids and relays.
+Three lug isolators without exciter input might not be usable with HVD.

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