ignition switch: "accesory" vs. "run"
Thread Starter
|
Logistics Pro
Joined: Jul 2005
Posts: 4,217
Likes: 154
ignition switch: "accesory" vs. "run"
The other day I drove my Dent to work so that I could bring some large garbage from home, and throw it in their dumpster.
I guess a good song must've been playing on the radio when I backed in next to the dumpster, because I turned the key back to "accessory," and hopped out to unload. When I got to the back of the truck, I saw that my back-up lamps were lit! Befuddled, I walked back to the cab to turn the key to "off," and when I opened the door, I noticed that the heater blower was still running too!
Is it supposed to work that way? I looked at the wiring diagram for the '76 models on another site, and it looks like "accessory" and "run" both power the same wires! If I'm reading that diagram right, there is a buss-bar, or whatever, jumpering the two positions right there at the switch.
I'm tempted to try turning it to "accessory," and then hot-wiring the primary circuit post on the starter motor relay, to see if it will actually fire up that way!
I guess a good song must've been playing on the radio when I backed in next to the dumpster, because I turned the key back to "accessory," and hopped out to unload. When I got to the back of the truck, I saw that my back-up lamps were lit! Befuddled, I walked back to the cab to turn the key to "off," and when I opened the door, I noticed that the heater blower was still running too!
Is it supposed to work that way? I looked at the wiring diagram for the '76 models on another site, and it looks like "accessory" and "run" both power the same wires! If I'm reading that diagram right, there is a buss-bar, or whatever, jumpering the two positions right there at the switch.
I'm tempted to try turning it to "accessory," and then hot-wiring the primary circuit post on the starter motor relay, to see if it will actually fire up that way!
Senior User
Joined: Apr 2004
Posts: 235
Likes: 1
From: Fayetteville, NC
Most everything electrical powers up on accessory except the ignition coil. That way you can sit and listen to radio, wipe windows, etc. Without overheating the coil. If the engine is not running and the switch is in ignition for too long it can overheat the coil causing it to fail. During normal operation the coil is pulsing as the points or ignition module powers and depowers it to fire the plugs.
Thread Starter
|
Logistics Pro
Joined: Jul 2005
Posts: 4,217
Likes: 154
I'll have to scrutinize that diagram again, because I couldn't see how the ignition wouldn't be powered up with the switch at "accy."
Thread
Thread Starter
Forum
Replies
Last Post
rlay302
1973 - 1979 F-100 & Larger F-Series Trucks
7
Dec 8, 2012 02:58 PM
Lost_Arkitekt
1961 - 1966 F-100 & Larger F-Series Trucks
9
Oct 14, 2009 08:46 PM
gateway-broker
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
5
May 9, 2004 08:35 AM
tamarackstyle
1973 - 1979 F-100 & Larger F-Series Trucks
2
Mar 26, 2004 11:37 AM
