Need some wiring help with OPS Relay Mod and 2nd pump selector Relay - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Old 03-23-2010, 09:42 AM   #1 (permalink)
Graplr
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Need some wiring help with OPS Relay Mod and 2nd pump selector Relay

So I am doing the OPS relay mod seen here- https://www.dieselplace.com/forum/sho...d.php?t=268296

I need a 2nd relay to control the other two lift pumps for the WVO system (both pumps run at the same time and run off ONE pin on the second relay #1 is to pull from the WVO tank and #2 is before the IP to insure adequate pressure at highway speeds and at WOT).

I followed the mod on page 6 of the above thread showing how to wire it so that I still take the load off of the OPS AND am able to have a selector relay for the pumps.

See the attached pic. I can't get both the OE and WVO pumps to work off of the 2nd realy. And the only way I can get the OE LP to run is to wire the gray wire from the OPS BACKWARDS so that the wire going to the lift pump is on pin 86 of relay #1 and the OPS wire is on pin 87a of relay #2 (See the attached diagram). If I wire it the way page 6 says the OE pump doesn't run but the WVO pumps do when I power the switch.

What is wrong with my wiring? I tried a NEW relay and it still behaved the same.

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File Type: bmp 2.bmp (1.86 MB, 926 views)
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Ryan
SOLD-1996 Chev K2500 Pickup 6.5 Odometer says 135k miles but not working
Bought for $900-On the road after Turbo replacement, New LP. Ignition Switch
SOLD-1994 Chev Suburban K2500 6.5 258k miles
-Diamond Eye Exhaust with muffler & 2.5" FloPro Crossover Pipe
-LubSpec Oil Cooler Kit, -Webasto Diesel Coolant Heater w/Remote Start
-Remote PMD on Heat Sync in bumper, HID Headlights w/new lenses
-Newer IP, New Bosch Injectors, New Bosch Duraterm Glow Plugs, Newer Radiator
-PYO Aluminum Wheels, Bridgestone Dueller II A/T tires
-Boost, Fuel Pressure, EGT Gauges, K47 intake w/Amsoil EaA 112 Air Filter
-Rebuilt Transmission @ 227k miles
-LP Relay Mod, High Idle Switch Mod, Glow Plug Override Mod, Battery Terminal Mod
-New OPS, Batteries, Brakes, Starter, Alternator, Fuel Lines, Lift Pump, Vacuum Pump -GMTD Scan Tech
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Old 03-23-2010, 12:02 PM   #2 (permalink)
Graplr
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Here is the pic embedded-



__________________
Ryan
SOLD-1996 Chev K2500 Pickup 6.5 Odometer says 135k miles but not working
Bought for $900-On the road after Turbo replacement, New LP. Ignition Switch
SOLD-1994 Chev Suburban K2500 6.5 258k miles
-Diamond Eye Exhaust with muffler & 2.5" FloPro Crossover Pipe
-LubSpec Oil Cooler Kit, -Webasto Diesel Coolant Heater w/Remote Start
-Remote PMD on Heat Sync in bumper, HID Headlights w/new lenses
-Newer IP, New Bosch Injectors, New Bosch Duraterm Glow Plugs, Newer Radiator
-PYO Aluminum Wheels, Bridgestone Dueller II A/T tires
-Boost, Fuel Pressure, EGT Gauges, K47 intake w/Amsoil EaA 112 Air Filter
-Rebuilt Transmission @ 227k miles
-LP Relay Mod, High Idle Switch Mod, Glow Plug Override Mod, Battery Terminal Mod
-New OPS, Batteries, Brakes, Starter, Alternator, Fuel Lines, Lift Pump, Vacuum Pump -GMTD Scan Tech
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Old 01-17-2015, 03:20 AM   #3 (permalink)
tornado842
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This has come up during a few conversations and many search results. I thought I should post the correct version of the wiring. The first diagram will turn off the LP when the WVO is requested. The second diagram will run the LP all the time and the WVO when requested.




Last edited by tornado842; 01-17-2015 at 03:34 AM.
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Old 01-17-2015, 11:06 AM   #4 (permalink)
Freddyack
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