Hi Everyone,
Could someone explain to me how exactly the 12/24V relay works based on the FSM wiring diagram.
As far as I can tell from the diagram:
1. + from the LH battery connects to the first (left hand) terminal on the 12/24 switchover relay and directly to terminal C on the starter
2. - from the LH battery connects to chassis and to the second terminal on the relay
3. + from the RH battery connects to the third terminal on the relay
4. the fourth terminal on the relay connects directly to ground chassis
So if the +12V from the LH battery is always connected to the starter, and the starter grounds to the chassis, what does the relay do to give 24V to the starter?
UPDATE: Looks like there is a major error in the FSM diagram I posted - the starter battery (LH) does NOT connect directly to chassis ground, it only connects to ground via the 12/24 relay.
- When the relay is off, LH- is grounded to chassis.
- When the relay is on, LH- is connected to RH+, thus putting them in series and creating 24V on the lead from the LH battery to the starter relative to chassis ground from the RH battery.
Could someone explain to me how exactly the 12/24V relay works based on the FSM wiring diagram.
As far as I can tell from the diagram:
1. + from the LH battery connects to the first (left hand) terminal on the 12/24 switchover relay and directly to terminal C on the starter
2. - from the LH battery connects to chassis and to the second terminal on the relay
3. + from the RH battery connects to the third terminal on the relay
4. the fourth terminal on the relay connects directly to ground chassis
So if the +12V from the LH battery is always connected to the starter, and the starter grounds to the chassis, what does the relay do to give 24V to the starter?
UPDATE: Looks like there is a major error in the FSM diagram I posted - the starter battery (LH) does NOT connect directly to chassis ground, it only connects to ground via the 12/24 relay.
- When the relay is off, LH- is grounded to chassis.
- When the relay is on, LH- is connected to RH+, thus putting them in series and creating 24V on the lead from the LH battery to the starter relative to chassis ground from the RH battery.
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