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Old 11-02-2008, 03:05 PM
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Weldon 14000 dial a flow relay wiring

How do you guys wire a relay for + "ignition on" to the controller?

PS I found that these are much more HD and reliable pentiometers and knobs (sealed pot and 1 mil cycles) and are cheap.

PE30FL-1.0K-ND Pent 22.74
226-4079-ND Knob 7.45

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Old 12-19-2008, 02:07 PM
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I will try again
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Old 12-20-2008, 07:58 AM
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Activation - Most GM fuse boxes have an ignition-on tab next to one of the fuses, or you can tap into a wire for an ignition-on accessory (wipers, radio, etc.). That wire can be used to activate the relay. On a Bosch relay you can ground the 86 terminal and connect the 85 terminal to the ignition-on 12 volts.

Controller power - Then wire the high-amp terminals of the relay into 12 volt power (with a fuse) on one side and to the controller on the other side. Connect the fused power side to terminal 30, and connect the controller power line to terminal 87. Most Bosch relays are good for 30 amps, so you should use about 12 gauge wire and a 30 amp fuse.

Bruce
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Old 12-20-2008, 11:01 AM
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so if I undersatnd correctly:

using std duty single pole (spst) Bosch/Tyco 30 amp relay

85 to 12+ ig on min 16 ga wire
86 to ground min 16 ga wire
87 to Weldon Controller Batt+ term min 16 ga wire
30 min 12 GA wire 30amp inline fuse min 12 GA wire to 12 volt positive source

(With the power and ground wires on the larger series 2345 pump being 10ga I will just use 10-14 ga wire... and a HD motor controler Tyco relay.)

All wire being tinn coated, fine strand, and connections crimped/soldiered shrink wrap covered.

Sound correct ?

Last edited by OHD; 12-20-2008 at 11:07 AM.
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Old 12-20-2008, 12:33 PM
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The basic connections you described will work, but change the 16 gauge power input wire on terminal 87 to a 12 gauge. I picked 12 gauge wire for the main power because that will work up to about 30-40 amps, but you need to verify how much power the controller draws. If a 2345 pump needs a 10 gauge power wire, then it probably draws quite a bit more than 30 amps.

Its fairly easy to find a Bosch relay rated at 40 amps, but a little harder to find the 70 amp version (mail order electronic stores do carry them). For high amp fuse holders (above 30 amps) you can look in the car stereo wiring section, where they should have fuse holders for mega-fuses. The weather resistant fuse holders are a little more expensive.

When looking for high amp relays, make sure they are rated for continuous duty. Many starter relays have high amp ratings, but they won't hold up under continuous operation. If the motor controller relay you want to use is continuous duty and has the right amperage rating, it should work.

This web site has some suggestions on what wire sizes to use, based on amperage.
http://www.the12volt.com/info/recwirsz.asp

Bruce
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Old 12-20-2008, 02:20 PM
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I will use Tyco 75 amp continous heavy duty motor relay with maxifuse holders, 10 ga wire inline fuse, I plan on using a 40mp fuse. 10ga & 12ga wire is what I was planning. Thanks
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Old 12-20-2008, 04:21 PM
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Sounds like you've got the right plan.

Bruce
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