MONTE CARLO "COPO" Monte Carlo SS - Turbosaurus Build (forever stuck in wiring hell)

motorheadmike

motorheadmike

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Nov 18, 2009
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You are strange. But, in the spirit of the subject here is today's progress. Tear it all down and build it back up in your image. While LT1swap.com is a great resource - I cannot identify with the massing of key-on (IGN Pink) wires on a single circuit/fuse) as it makes diagnostics a nightmare.

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Long story short (and this work took forever between mapping out, marking, and building the circuits): I upped the gauge on the fuel pump relay, took the 60A Maxi fuse and fed it to two 30A fuses (that I added to the block) which go to two relays (triggered by a split key-on wire) that give me the O2 A & B and INJ A & B circuits (each will have a 15A fuse in line). And that's how you get to have something to diagnose failure... which ironically could come from all my fabricobbling.
 
motorheadmike

motorheadmike

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I was digging around in my pigtail stash looking for an IAT connector (found it!) and happened across this too:

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https://ls1tech.com/forums/conversi...coolant-sensor-conversion-part-numbers-2.html

It is for a 3 wire CTS - which (as I understand it) allows you to connect to the factory gauges (which I intend to do). Now I just need to buy that 3 prong CTS.

And then figure out how to make the oil pressure gauge work too? There is a thread around here somewhere...
 
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motorheadmike

motorheadmike

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Here are some other handy LS swap electrical bits...

Converting a truck harness to LS7 MAF (pin swap): https://ls1tech.com/forums/conversi...g-ls7-maf-lq4-harness-pinout-differences.html

From the pinned post (https://gbodyforum.com/threads/gbody-ls-swap-info.62539/)

GAUGES:
Stock Gbody Gauges will work with LS Sending Units.
Fuel gauge and Volt gauge are in the car wiring and works.
Oil pressure: hook up the Sending Unit from the Engine to the wire for the gauge in the cluster.
Tach: wire PCM Red/Green Pin 10 in the LS Engine Harness to the Tach in the Cluster, set the pulse correctly in the tune.
Water Temp: You need 1998 3-wire Temp Sensor GM Part # 12551708, wire Pin C to the Temp gauge in the cluster.

Speedometer: if using an electronic transmission, convert the speedo gauge in the cluster to electronic. Wire the VSS from Red/Green Pin 50 in the LS Engine Harness, can be calibrated correctly in the tune.
 
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motorheadmike

motorheadmike

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These will be here shortly...

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I am getting the coolant filler neck because I cannot bring myself to cut a hole in the core support at this time (seems like a total PITA. So I guess I am going to have two rad caps and two failure points, eh?
 
8

81cutlass

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Feb 16, 2009
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A 99-02 silverado oil pressure sensor makes the stock oil pressure gage work perfect.

I have that 98 f body coolant temp sensor in the head and the 99-03 oil pressure gage wired into the stock g body harness running my 2+2 coolant and oil pressure gage. Works good.
 
motorheadmike

motorheadmike

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Nov 18, 2009
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A 99-02 silverado oil pressure sensor makes the stock oil pressure gage work perfect.

I have that 98 f body coolant temp sensor in the head and the 99-03 oil pressure gage wired into the stock g body harness running my 2+2 coolant and oil pressure gage. Works good.
Good news this engine is from a '99 Silverado, eh?! Thanks for confirming that.
 
motorheadmike

motorheadmike

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Well hello, beautiful!

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8

81cutlass

Royal Smart Person
Feb 16, 2009
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Western MN
Good news this engine is from a '99 Silverado, eh?! Thanks for confirming that.
Yup, I don't know why they make all those adapter fittings to go from the M14 o-ring port to whatever pipe thread the factory G body style 80's sensors are, especially when the stock LS one works.

I assume nobody ever thought to just check the ohm readings of the 99-02 sensor and compare it to the ohm data GM used from the 60's on. Surprise, GM was smart and kept it the same.....
 

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