Battery Drain Problem
 

I have a small power drain in my '70 that I'm trying to narrow down. It drains the battery in about 36 hours. What are all the items that have direct power besides the light switch and starter? I'm thinking my ignition switch may be the problem but I haven't had a chance to test it yet. When I dosconnect the battery I can hear something "click".... open relay? What relays stay hot (direct powered) on the firewall?

There is no stereo or amp or anything like that installed so that's not a problem.

other than ignition switch and headlights is the cigarette lighter brake lights and maybe the horn im betting its in the ignition tho

the horn relay is hot all the time
best thing to do is remove 1fuse at a time using a test light to see where the drain is

does your horn work? It is the first place I go when I have a battery drain. It has been the problem more times that it hasn't.

No cigarette lighter and the horn is disconneted (because it stuck on me once.....that was funny/embarrassing). The brake light does stay on sometimes but I'm now in the habit of checking it when I get out of the truck...... thanks again gents for the help!

What does the "Transmission Spark Control" relay do and is it a direct wire?

Did you just unhook the horn wire or unhook the power to the relay? The relay can still drain power if it is the prob. The TSC relay could be another source. If it is not working I would just unhook it. good luck The TSC allows vacuum advance only in high gear. John

Good point about the horn, I hadn't thought about that..... when it stuck on me I just figured it was stuck at the horn button on the steering wheel and when I couldn't get it off quick enough I just pulled over and unhooked it from the horn. So since it's still "hot" and grounds through the bracket that still completes a circuit.