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Registered
Join Date: May 2010
Posts: 206
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Alternator charging now but drains the battery
Well I thought I had all the bugs out of my 1980 euro 4.7 shark, however there is one left. while putting it back together I found out I had a battery drain, so I pulled all fuses and relays, test light still on, so i pulled all the pin plugs at the bottom of the fuse block the drain went away when I got to plug O which is the blue wire leading to the alternator. Plug O is right below the three red main power wires, Right next to O is a gray factory jumper wire which supplies power to the blue wire on plug O and this pin always has power going to it with the key on or off. the blue wire I believe is #61 on the back side of the alt, I pulled out the fuse block to take a look at the back side to see if it had any repairs but did not see any. So I am stuck now, any thoughts on this would be very helpful, does anyone out there know where this jumper wire pin get its power from? I am so close now but no cigar yet, I messed with it for a few hours yesterday but no luck so far. Thanks, Steve
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05-25-2012, 06:05 AM
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Petie3rd
Join Date: Jul 2000
Location: Philly PA
Posts: 4,528
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have you removed all of the relays and inspected/ cleaned them ?
Any relay with corroded pins should be opened and smelled for burning, and contact inspection/ cleaning
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^^^ Stan ^^^ 2019 BMW K1250 GS 2016 HD RK 1988 S4 Auto , Elfenbein Perlglanz, Pearl Gray 1982 5sp Met black and tan sport seats |
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05-25-2012, 09:43 AM
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Registered
Join Date: May 2010
Posts: 206
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Just found the problem, the factory gray jumper wire was on the wrong pin, it was pluged into a pin which is not used and has power all the time, this caused the 12 volt drain, found a picture in the factory book where the jumper wire goes, anyway this has fixed the problem and my charging system is still charging. Thanks all and have a great holiday,I know I will, Steve
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05-25-2012, 09:58 AM
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Moderator
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Wow, thats great detective work. I wouldn't have figured that one out. Great job!
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior 1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD** 
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05-25-2012, 02:27 PM
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Engineer of profanity
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I agree that might have stumped me for a year or two as well.
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1970 Porsche 911T Black 1990 Porsche 944 S2 Red on cashmere 1984 Porsche 928S Euro ROW GP white on black |
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05-25-2012, 03:04 PM
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