Jump to content

Tracing voltage


Guest
 Share

Recommended Posts

Okay, my dad has a '68 Land Rover 109" IIA. It has a Chevy 250 motor in it, which uses standard GM starter and internally regulated alternator. My dad has had starting and charging problems since he got it, buy it peaked the other day when it died. We have now been trying to trace the wiring to figure out just where all the juice if flowing to and from. This is not easy because the wiring consists of a mix of 30 year old Lucas and new wiring from added accesories that my dad put it. Anyway, below is a simple diagram of part of the system. With everything off, at point A, 12V is there. My question for now is this: should there also be 12V coming out at point B?(See Attatchment)

I haven't yet traced where the wire from point B is going, but I think it is going to the charge light. My guess is that after the charge light, it then goes to either the ign. switch, or to a small fuse block, and then to the ign. switch. Sound right?

Link to comment
Share on other sites

Thanks. Okay then, so how about the wire that goes from the starter to the ign. switch. Is that hot or is does that become hot when you turn the key to start? If its the latter, where then does the ign. switch usually get its hot 12V from?

P.S. Thanks for pointing out the email error. I'm actually out of state right now, so I haven't been checking my valid email for awhile, so it wouldn't have mattered.

Link to comment
Share on other sites

starter(GM) large terminal - 12V+ battery cable #2ga - on gm and most automobiles you would also have a IGN HOT WIRE (12ga-10ga) and could be connected to Hot terminal on ign switch / Headlight switch / Heater/ etc.

Have also see in older Jeeps - ign switch get its power from neg side terminal(wire side connected to battery) on AMP gauge. AMP gauge wiring is starting at starter solenoid / battery terminal to amp gauge to 12V+ terminal on alt

without a wire diagram of vehicle this is pretty simple <img src="http://www.aaca.org/ubbthreads/images/graemlins/grin.gif" alt="" />

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...