Electrical Question - Will this work?
#1
Electrical Question - Will this work?
I'm wondering if anyone can tell me if I'm on to something with the following idea:
Relay 1 (the transmission switch) would be a SPDT
86 - from transmission
30 - from battery
87a - N/C
87 - N/O power to lights
85 - ground
Relay 2 would be for the cab switch and is a SPST
86 - from switch
30 - from N/C (87a) of relay 1
87 - N/O power to lights
85 - ground
My idea goes like this - generally the cab switch is off (N/O) and the lights are only generally triggered by the transmission switch. If the 86 on relay 1 is NOT energized the power from 30 (#1) goes through 87a (#1) and heads to 30 (#2) and stops and is available for user input from cab switch. If 86 (#1) is energized (Closed) then the power 30 (#1) runs through 87 (#1) and powers the lamps. If the cab switch (relay 2) is used when the truck is in reverse it wouldn't matter because it is already energized but should the transmission go back to neutral (open switch) then the power would be as explained above and now go from 30 (#2) and travel through 87 (#2) and power the lamps.
So, is that the right idea? Please let me know if I'm on to something as this is all a bit too confusing for me.
Relay 1 (the transmission switch) would be a SPDT
86 - from transmission
30 - from battery
87a - N/C
87 - N/O power to lights
85 - ground
Relay 2 would be for the cab switch and is a SPST
86 - from switch
30 - from N/C (87a) of relay 1
87 - N/O power to lights
85 - ground
My idea goes like this - generally the cab switch is off (N/O) and the lights are only generally triggered by the transmission switch. If the 86 on relay 1 is NOT energized the power from 30 (#1) goes through 87a (#1) and heads to 30 (#2) and stops and is available for user input from cab switch. If 86 (#1) is energized (Closed) then the power 30 (#1) runs through 87 (#1) and powers the lamps. If the cab switch (relay 2) is used when the truck is in reverse it wouldn't matter because it is already energized but should the transmission go back to neutral (open switch) then the power would be as explained above and now go from 30 (#2) and travel through 87 (#2) and power the lamps.
So, is that the right idea? Please let me know if I'm on to something as this is all a bit too confusing for me.
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Wyatt Earp (05-22-2008)
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