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12-16-2013, 10:58 PM | #11 | |
Msgt USAF Ret
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,705
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Re: I suck at reading wiring diagrams..
Quote:
The large red wire on the top is the battery power wire from the engine compartment. The smaller red wire is for hot power to the horn relay the headlight switch or the fuse panel. They all need key off, hot power for the horn the lights or the brake lights without the key on. The wiring diagram shows them joined in the harness with the large battery wire and only one red wire going to the key switch. The double brown wire clockwise is for the brake warning light in the cluster and this wire goes from the brake distribution block to the key switch and then to the brake warning light in the dash cluster. It is just a ground connection when the brake block is out of sync between the front and rear brakes. The key switch grounds this wire to the switch body during starting just to test the warning light. It is the ground side of the warning light circuit. The double green wire next to it is for the temperature hot light in the idiot light cluster and it runs from the idiot light temperature sender in the engine head to the key switch and on to the cluster to the ground side of the temperature light. The same thing happens when the key is turned to start, the key switch grounds this wire to the switch body and completes the ground circuit for the temperature light, just to test the bulb. You may not have this wire if your truck has the gauge cluster and not the idiot light cluster. The pink wire is for the ignition and goes to the firewall plug where it connects to a resistor wire for the coil and another wire that goes to the starter R terminal ( usually yellow ) that bypasses the resistor wire during starting, to send a full 12 volts to the coil for hotter spark during start. If you convert to an HEI distributor, which requires a full 12 volts all the time, you will not need this resistor wire, or the yellow wire. The large purple wire is of course the starter solenoid wire. It runs from the key switch to the neutral start switch if you have an automatic and then to the firewall block where it continues on to the starter solenoid. The starter solenoid IS the relay to answer your first question. All the purple wire does is engage the solenoid, and the solenoid contacts energize the starter windings. The large double brown wire should be the accessory wire terminal. The larger brown wire goes to the fuse panel and feeds the turn signal and hazard light flashers and the power wires for those circuits which I pointed out in my post above about the half moon connector. The other brown wire should be a 10 ohm resistor wire which goes to the firewall block and then to the external voltage regulator. The ACC terminal has power when the key is in the ignition position and also when it is turned to the ACC position. There the ignition circuit is cut out of the power loop to prevent the coil from burning up. You still need the external voltage regulator unless the harness converts your alternator to an internal regulated style, or you do it yourself.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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