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Injector power wiring

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Old Dec 26, 2003 | 01:58 PM
  #1  
jeepguy553's Avatar
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From: Rockport, TX
Car: 1980 Jeep CJ7
Engine: AMC 360 with GM TBI
Transmission: TF727 set for kill...let's get it on!!!
Injector power wiring

Just discovered another wiring glitch that would have given me fits later on. It seems that I had the injector power wire tapping into an IGN feed, no juice in START. That would have been bad. Now, the question si this...would it be okay to just wire it directly to a BAT feed on the fuse box? I have a 7.5amp fuse wired inline to protect the whole thing, but I am kinda wary of running this straight to an ALWAYS HOT tap.
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Old Dec 26, 2003 | 02:31 PM
  #2  
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From: Moorestown, NJ
Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
You should be fine, other then the fact that the positive side will always be hot i dont think it should cause any problems
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Old Dec 26, 2003 | 03:12 PM
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RBob's Avatar
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
I run mine directly to battery voltage. You should use a larger fuse though. Either a 10A for each injector or a 20A if feeding both. Both on will peak at 4A each for 8A total.

RBob.
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Old Dec 26, 2003 | 03:13 PM
  #4  
jeepguy553's Avatar
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From: Rockport, TX
Car: 1980 Jeep CJ7
Engine: AMC 360 with GM TBI
Transmission: TF727 set for kill...let's get it on!!!
Thanks. I guess I could wire a switch in the circuit too to take power out when the engine isn't running. Could be useful for troubleshooting down the line too.
Just saw that last post. The 7.5 amp fuse is too small? Okay. Cool. I have a 20amp fuse outside that I can use. I just used the fuse rating that the wiring diagram specified. Maybe I read it wrong.
Thanks again guys...

Last edited by jeepguy553; Dec 26, 2003 at 03:15 PM.
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Old Dec 31, 2003 | 04:08 PM
  #5  
d_johnsen's Avatar
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From: British Columbia,Canada
Car: 1989 Firebird
Engine: L03
Transmission: 700r4
Axle/Gears: ?
Originally posted by jeepguy553
Thanks. I guess I could wire a switch in the circuit too to take power out when the engine isn't running
heh, that could be used as a kill switch
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Old Dec 31, 2003 | 05:41 PM
  #6  
jeepguy553's Avatar
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From: Rockport, TX
Car: 1980 Jeep CJ7
Engine: AMC 360 with GM TBI
Transmission: TF727 set for kill...let's get it on!!!
Or a REALLY tricky anti-theft device.
:lala:
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Old Dec 31, 2003 | 05:56 PM
  #7  
d_johnsen's Avatar
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From: British Columbia,Canada
Car: 1989 Firebird
Engine: L03
Transmission: 700r4
Axle/Gears: ?
heh thats what i meant
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Old Dec 31, 2003 | 06:35 PM
  #8  
Grumpy's Avatar
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From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
Batter->30A fuse-> relay triggered by Pink/Black key on power source-> injectors.

Fuse with 6" of battery.
10 ga wiring.
Shortest lenghts of wiring, and routing possible.
BOSCH Relay Only.

Disect all the relays you can, and you'll see why I say Bosch Only.

If you want to really bullet proof things, you'll do the same for the ignition.

The oem routing is dictated by the assembly line, and leaves alot to be desired. While you might read 0 ohms resistance there are high instantaneous loads, and changing the wiring on some cars makes a huge difference.
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