| Name | Post |
| Howard H | Maybe I'm just dim, but I'm having a hell of a time trying to decipher the Haynes wiring diagram for my 1974 2.0. Is there any publication available (short of the $375 set of manuals) that does a better job of guiding a person through the electrical troubleshooting process? Also, with the battery removed, I am reading about 3k ohms of resistance across the + and - cables. The way I figure it, that should mean an "ignition off" draw of 12v / 3k ohms, or only 4 milliamps of current. However, my new battery went dead overnight. What am I overlooking? I would really apprieciate any insight that anyone can provide. Thanks. |
| JP Noonan | If you are "dim" then so is just about everyonr else I've met who has used the Haynes manual. I think the Haynes disgram is from the factory manual so that won't help. The only thing that seems to help me was to write in what each component is next to its letter. Also I tend to use the older diagram whenever I can. To find a drain like that I would try disconnecting one component at a time, start with the ing coil, also see if the coil is warm witht the key off. Next disconnect the ing switch from the back of the key switch, these ing switches are notorios for strange failures. Before that though it is easier to remove one fuse at a time. This will at least tell you which circut is bad. However the ign is not on the fuse pannel, but check the seatbelt interlock relays under the passenger seat to see if they are warm with the key out. |
| brenckle | I had a problem with the Haynes diagram as well. There is a full color one online here from a 71 (?) that I had printed to poster size at a local copy shop. Well worth the $30 (there were 2 diagrams) I hung them on the wall of the garage. |
| Dave_Darling | Take Four! Will Netscape lock up when I hit "submit reply" *this* time? The 74 + diagrams aren't that awful if you're trying to figure out the functioning of a circuit, but they are that awful for figuring out where the wires and components go in the car. The early diagrams are much better for that. I'm not clear on what you measured the resistance across, but the right way to measure battery drain in a car with the engine off is with an ammeter. Radio Shack sells some reasonable multi-meters that include the ammeter function. Let us know what you find out! --DD |
| Wayne at Pelican Parts | Hi there everyone. The Haynes diagrams are indeed from the Factory Manuals. The later diagrams follow a current flow diagram instead of a voltage flow diagram. If you look at the diagram (color certainly helps) then you will see that it is actually easier to read than the early ones. Think of the top of the diagram as the battery, and the bottom as the ground plane. In this manner, you can troubleshoot one item without having to look at too much information. Another way of looking at it is to compare it to a hydro-power system. The top of the diagram corresponds to the top of a waterfall, the bottom, a pool. The battery is nothing but a pump that returns the water to the top. The water flows down through the system, turning components, and 'doing work' along the way. Just remember that the current, or water flow will always run downhill. I hope that this helps, and that it doesn't show that I'm actually a lunatic who pours water on his relay board? -Wayne |