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#1 |
Registered User
Join Date: Mar 2011
Location: Vancouver, Canada
Posts: 107
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Alternator wiring
I need to wire a 89 Blazer Alternator to work without the stock harness, I dont care about a idiot light but need to know which of the 3 wires on the plug into the back of the alternator is the voltage sensing wire that i need to connect to the + post to make it work? A buddy told me it was the middle wire of the three but want to confirm this.
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1984 3/4 Ton Reg cab Longbox 4x4, Carbed 350/Turbo 400 Trans/205 T-Case |
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#2 |
Registered User
Join Date: Mar 2011
Location: Vancouver, Canada
Posts: 107
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Re: Alternator wiring
really, out of all of you no one know which of the 3 wires is the voltage sense wire?
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1984 3/4 Ton Reg cab Longbox 4x4, Carbed 350/Turbo 400 Trans/205 T-Case |
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#3 |
Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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Re: Alternator wiring
I bypassed the factory wiring entirely when I upgraded to the CS144. I ran a wire from switched 12V+ at the fusebox, put a bulb in the wire, and ran it to the "I" terminal on the alternator. On your plug for the new alternator, it will have a larger sensing wire, loop that to the charging lug on the alternator, and run a larger gauge wire from that lug to the positive terminal of the battery. I used a 4 ga. wire, but just make sure it is at least 10.
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1974 Jimmy- 5.3/4L80e/NP241 |
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#4 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Alternator wiring
not sure if it applies
i went from(1978) idiot lights to factory gauges using the orange in the cluster plug, the brown is just wrapped in tape behind the cluster didn't need it, charges at 14+ to 15 on the stock gauge
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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