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Old 11-01-2005, 07:56 PM
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stock harness confusion

i'm about to put a 350 in my 85 monte ss and i have no clue what wires go where. ( i didn't take out the 305, i got it like that.) i know i need alt and dist. but there's alot more than that hanging around in there. and i can't tell which ones to cap off and which ones to use. the colors don't really match the wiring schmatic in my chiltons manual. can some one out there bestow upon me some electrical knowledge?

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Old 11-02-2005, 07:54 AM
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you'll have more luck posting in the electricity forum. The all-knowing Doc will help you out.
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Old 11-02-2005, 09:31 AM
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A carburated 350 is pretty simple.

You need one red wire to the distributor. Will be found near center on the firewall.

On the lower passenger side of the vehicle you will find three red wires with fusible links. These attach to the large starter solenoid pin along with the positive battery cable. There will also be one purple wire that goes to the solenoid small pin.

Follow the red wires from the starter. One will have an O connector which goes to the back of the alternator. The other goes to a two prong plug for the alternator. The red is field winding and the other (usually tan) is the idiot light.

On the drivers side. Near the front of the engine. There will be a wire for the temp light. I think its white.

The last wire you will need is the oil pressure light. It will be found in the center of the firewall. I can't remember the color of that one but I think its green.
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Last edited by bracketeer; 11-02-2005 at 09:36 AM.
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Old 11-14-2005, 04:59 PM
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the entire harness on pass side of the engine compartment you wont need at all if you arent going to run computerized engine controls, emissions equipment, and non CCC carb in it

you can remove the ECM and entire harness, as it does not contain the alt and starter wiring

this is why you see all the extra wiring under there

yank the entire harness, you can completely remove it without any cutting, if you unplug it at the ECM inside the car too, then pull it through the firewall towards inside into the car, and then it will be all removed once big chunk

80-up cars and trucks all have this extra harness unless they are heavy GVRW

temp light wire is always green
looks just like a/c compressor wire

oil light is brown or blue

its random in gm vehicles, you just never know the color of the oil sender wire
it can be jut about any color almost

a/c and oil are separate from the ecm harness also

you might evne have an electric choke wire, they are usually blue, it is also part of the car driver side harness, it will stay with the car also when you remove the ecm harness

all the required engine wiring is driver side of compartment

goes in through fuse block connection on firewall
dont cut any of the wires on driver side of car


good luck

Last edited by fast68; 11-14-2005 at 05:06 PM.
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