This is on a 1989 F-150. The truck sits for a long time, probably over
six weeks since it was last used. The battery light comes on, and the
(built in) voltmeter is lower than normal, but still in the "OK" range.
If I put an analog meter across the terminals, the battery reads 12
when not running, and about 14 when "charging". I would guess that
both of these numbers are on the low side of "OK". The truck starts
and runs fine, but I don't want to really road test it. Battery is
charged up, and it cranked and started fine after the six week
There is a relay next to the coil (on the left cylinder bank) that
keeps on clicking after I shut down the truck, if I smack it it stops.
Also, it seems like, when I first start it, maybe the AC is running
regardless of switch position. I'm not sure, but if I turn the AC on
just after startup, I don't here any difference (from inside the cab),
but when I then turn it off it kind of "thunks" and gets quieter.
Does the light come on below a certain voltage (14.6, 14.9, ??). I'd
think that 14+ volts would charge it up, is that not the case? As I
mentioned, it sat for awhile before this happened. Should I be looking
for corroded connectors, or what?
Thanks for any and all help,