electrical woes
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Cargo Master
Joined: Oct 2004
Posts: 2,148
Likes: 0
From: Seneca, SC
electrical woes
ok so a guy who works with me has a 68 f100 with unfortunatley a 327 and all Gm electrical. Now for those of you guys that aren't repulsed, the thing has some kind of drain of the alternator. He's only getting 9.5 volts at the battery, and he's checled that circuit backwards and forwards. He also replaced the voltage regulator (i thought that the gm had that incorporated in the alternator). Well he's still scratching his head and has a known drain on the battery when he turns the motor off. Anyway, is there anything that we're missing here? Basically he's about to have to take it to a shop and have the guys look at him wierd for not fixing it himself. I'm telling him to remove that 327 or get a new harness, but I'm joking. Any help would be appreciated.
Logistics Pro
Joined: Apr 2005
Posts: 4,221
Likes: 17
The early GM systems did have the external voltage regulator.
With the ignition turned off and all accessories turned off disconnect one of the battery terminals. If you get even a small spark while disconnecting or hooking up the battery then you definitely have a drain somewhere.
And get rid of that 327.
With the ignition turned off and all accessories turned off disconnect one of the battery terminals. If you get even a small spark while disconnecting or hooking up the battery then you definitely have a drain somewhere.
And get rid of that 327.
New User
Joined: Jan 2004
Posts: 24
Likes: 0
From: wisconsin
sorry to rip on your buddy but i really think his problem is the entire motor, ya see, anyone who puts a chebby motor in a ford is cursed from the get go! ,. its almost like eating cookies while drinking a beer! some things just dont belong!
Senior User
Joined: Aug 2001
Posts: 212
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From: Wimberley, TX
You mention that he only has 9.5V at the battery, is that with the engine running or with everything shutoff?
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Laughing Gas
Joined: Jan 2002
Posts: 1,008
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From: Tucson
One way to check for the drain is to remove the negative cable from the batter and hook a 12 volt test light between the battery post and the cable you just removed. If you have a drain the light will glow brightly. Then just start unplugging stuff one by one. When the light goes out, you have located the source of the battery drain. Good luck and let us know how he makes out.
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Cargo Master
Joined: Oct 2004
Posts: 2,148
Likes: 0
From: Seneca, SC
he found a few drains, one in the electric choke of the carb, another somewhere else, I can't remember. Thanks for the method, I'll let him know. I think he's gonna sell the truck though, and get something newer. I'm trying to talk him out of it, but ultimatley it's his decision, and I don't have the money to buy it off him.