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Old 12-26-2012, 05:22 PM
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1970 chevelle engine wiring

here my wiring
everything is not connect....like a mess

1 green
2 black and purple
1 light blue
2 dark blue ( one is for temp or oil )
1 big purple ( for the starter )
1 big yellow
1 yellow
1 black and yellow

wich one is going at the + on the coil ????
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Old 12-26-2012, 08:07 PM
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Old 12-26-2012, 09:40 PM
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Here's a couple more diagrams that may be easier to read. If you still have points you'll need 2 wires to the coil, one with a resistor in the circuit.
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Old 12-27-2012, 02:33 PM
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thanks for the diagram

yes i have point

on the diagram the resistance wire its white orange purple ?
all those color together on one wire ?
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Old 12-27-2012, 02:51 PM
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Quote:
Originally Posted by crownver View Post
Here's a couple more diagrams that may be easier to read. If you still have points you'll need 2 wires to the coil, one with a resistor in the circuit.
didn't Chevy drop the inline resistor before 1970?
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Old 12-27-2012, 02:57 PM
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yes but still.... i still doesnt know wich cable go to the + at the coil
the color doesnt match the diegram

any suggestion?
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Old 12-27-2012, 03:05 PM
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There's a pretty easy way to check. Put a test light on one of the wires and then turn the key on. If it lights up it has 12 v. Then turn the key to the start position and see if it stays lit up. If it doesn't, then move to the next wire. The ignition will turn on power to the coil, but will interrupt power to other items when the key is turned to the "start" position.
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Old 12-27-2012, 03:54 PM
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ohhh thanks its all i needed

thanks a lot
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Old 12-27-2012, 03:54 PM
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I thought if you had points you need a resistor to keep the points from burning.
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Old 12-27-2012, 07:03 PM
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Quote:
Originally Posted by crownver View Post
I thought if you had points you need a resistor to keep the points from burning.
Only if you leave your ignition on when the engine isn't running, and the points are in the perfect situation to try and fire. The reason Chevy went to an "acc." position on their key switch was to stop frying points. It brings on the system without giving power to the coil.
I've run a lot of 60's and 70's Chevys without a resistor and not burnt up points. Not running a resistor in my 327 powered gasser now, or my 427 powered Camaro, and no issues.
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Old 12-27-2012, 10:30 PM
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Quote:
Originally Posted by crownver View Post
I thought if you had points you need a resistor to keep the points from burning.
You do. GM went to a resistance wire needed for the points-type ignition system, instead of using a ballast-type resistor.

Whether a resistor (wire or otherwise) is needed or not depends on the type of ignition system being used and the coil resistance.
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Old 12-27-2012, 11:32 PM
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the 70 velle has a res. wire to coil..if running hie you have to bypass it..
as it drops volts to around 9v

I most times tap into the wire at the firewall bulkhead connector.. soldering in a splice.. leaving the old wire intact..
run the new wire and tape up the old one and wiretie it..
if your hei /etc fails you can drop the points dissy back in and untape the wire and down the road you go.. this is a plus with the drop in electric conversions.. as when they fail you just drop the points back in and go..
and murphy's law is because you have a back up. you'll never need it..
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Old 01-18-2013, 10:44 PM
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Quote:
Originally Posted by Vincentnova View Post
thanks for the diagram

yes i have point

on the diagram the resistance wire its white orange purple ?
all those color together on one wire ?
It can be any one of those colors because this is a wirng diagram used over a period of years, not just 1970. I have white wires on 3 1970 Chevelles and the wire inside is a bright silver 16 gauge resistance wire.
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Old 01-19-2013, 05:51 AM
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Gm wiring

for some dumb reason GM repeated the same colors, but used different wire sizes for different things, I had Elect systems for a while when I was an engineer at Ford. We used to say the GM guys only had an 8 crayon box when they were a kid, and didn't know about more colors or wires with color stripes.
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Old 01-21-2013, 08:13 PM
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should i have two red cables at the starter , i mean cable from the battery and one more

beside the big purple i dont have any more 10ga cable
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