Engine wiring help
October 20th, 2020, 08:13 AM
#1
69 Ol' Blue
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Join Date: Jan 2020
Location: Southwest Virginia
Posts: 202
Engine wiring help
Question about these wires coming from the harness that has the purple starter wire. I believe this black wire goes to the positive side of the coil but I'm not sure about the yellow wire attached to it. Its on a manual trans 69 442.
October 20th, 2020, 10:00 AM
#2
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Join Date: Jan 2010
Location: central Indiana
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That goes to the positive side of the coil. The black wire is actually a resistance wire, it drops ignition voltage down to around 9 volts while the engine is running.
The yellow wire also goes to the positive side of the coil, the other end goes to the R terminal at the starter solenoid. When your cranking the engine, the starter will pull system voltage down due to the heavy current draw. The ignition won’t fire if the only power source is thru the resistance wire ( if the resistance wire normally drops voltage to 9 bolts, the starter draw will drop it even more). The yellow wire supplies battery voltage during cranking, bypassing the resistance wire.
Hope that helps.
The yellow wire also goes to the positive side of the coil, the other end goes to the R terminal at the starter solenoid. When your cranking the engine, the starter will pull system voltage down due to the heavy current draw. The ignition won’t fire if the only power source is thru the resistance wire ( if the resistance wire normally drops voltage to 9 bolts, the starter draw will drop it even more). The yellow wire supplies battery voltage during cranking, bypassing the resistance wire.
Hope that helps.
October 20th, 2020, 02:21 PM
#3
69 Ol' Blue
Thread Starter
Join Date: Jan 2020
Location: Southwest Virginia
Posts: 202
That goes to the positive side of the coil. The black wire is actually a resistance wire, it drops ignition voltage down to around 9 volts while the engine is running.
The yellow wire also goes to the positive side of the coil, the other end goes to the R terminal at the starter solenoid. When your cranking the engine, the starter will pull system voltage down due to the heavy current draw. The ignition won’t fire if the only power source is thru the resistance wire ( if the resistance wire normally drops voltage to 9 bolts, the starter draw will drop it even more). The yellow wire supplies battery voltage during cranking, bypassing the resistance wire.
Hope that helps.
The yellow wire also goes to the positive side of the coil, the other end goes to the R terminal at the starter solenoid. When your cranking the engine, the starter will pull system voltage down due to the heavy current draw. The ignition won’t fire if the only power source is thru the resistance wire ( if the resistance wire normally drops voltage to 9 bolts, the starter draw will drop it even more). The yellow wire supplies battery voltage during cranking, bypassing the resistance wire.
Hope that helps.
October 20th, 2020, 07:02 PM
#4
69 Ol' Blue
Thread Starter
Join Date: Jan 2020
Location: Southwest Virginia
Posts: 202
That goes to the positive side of the coil. The black wire is actually a resistance wire, it drops ignition voltage down to around 9 volts while the engine is running.
The yellow wire also goes to the positive side of the coil, the other end goes to the R terminal at the starter solenoid. When your cranking the engine, the starter will pull system voltage down due to the heavy current draw. The ignition won’t fire if the only power source is thru the resistance wire ( if the resistance wire normally drops voltage to 9 bolts, the starter draw will drop it even more). The yellow wire supplies battery voltage during cranking, bypassing the resistance wire.
Hope that helps.
The yellow wire also goes to the positive side of the coil, the other end goes to the R terminal at the starter solenoid. When your cranking the engine, the starter will pull system voltage down due to the heavy current draw. The ignition won’t fire if the only power source is thru the resistance wire ( if the resistance wire normally drops voltage to 9 bolts, the starter draw will drop it even more). The yellow wire supplies battery voltage during cranking, bypassing the resistance wire.
Hope that helps.
October 21st, 2020, 05:57 AM
#6
69 Ol' Blue
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Join Date: Jan 2020
Location: Southwest Virginia
Posts: 202
October 21st, 2020, 06:37 AM
#8
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Location: Northern VA
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