Battery charger blows 20 amp fuse to HEI? - Chevelle Tech
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Electrical & Wiring Troubleshooting electrical problems.

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  #1  
Old Feb 18th, 08, 12:33 AM
dscabra dscabra is offline
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Default Battery charger blows 20 amp fuse to HEI?

I have some sort of drain on my electrical system that has been an annoyance for the most part. As long as I start and drive the car fairly regularly, I don't have any problems. This year, the weather has been much colder than normal and I have found my car's battery dead more than I like. I had one of those small chargers that you can pick up just about anyplace, but after it failed to charge my battery, I splurged and bought a large cart-style charger at Sears. The first time I used it, I had the battery disconnected and everything worked just fine. The next two times I used it, I left the battery connected to and each time, the car failed to start after wards due to a blown fuse that feeds the HEI. Any ideas why this would be happening?

Thanks,
Dave
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  #2  
Old Feb 18th, 08, 6:02 AM
elcamino66 elcamino66 is offline
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Default Re: Battery charger blows 20 amp fuse to HEI?

The HEI should not have power unless the key is on!! How do you have that wired?
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Old Feb 19th, 08, 5:59 PM
dscabra dscabra is offline
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Default Re: Battery charger blows 20 amp fuse to HEI?

Quote:
Originally Posted by elcamino66 View Post
The HEI should not have power unless the key is on!! How do you have that wired?
It looks like the hot wire is running directly from the HEI to the fuse block.

Dave
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  #4  
Old Feb 24th, 08, 9:38 PM
dscabra dscabra is offline
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Default Re: Battery charger blows 20 amp fuse to HEI?

Update:

I took the car out today and when I got on the throttle it looked like my entire electrical system was shorting out. I have digital gauges, which would cut off along with the stereo for a split second then come back on. The car continued to run, but at one point it stumbled during one of these episodes.

Could I have a loose ground wire someplace?

Dave
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Last edited by dscabra; Feb 24th, 08 at 9:57 PM.
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  #5  
Old Feb 24th, 08, 11:03 PM
undee70ss undee70ss is offline
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Default Re: Battery charger blows 20 amp fuse to HEI?

What does the volt gauge read when this happens?
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  #6  
Old Feb 25th, 08, 6:12 PM
dscabra dscabra is offline
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Default Re: Battery charger blows 20 amp fuse to HEI?

Quote:
Originally Posted by undee70ss View Post
What does the volt gauge read when this happens?
Volt gauge reads normal (13.5-14.0 volts), but goes out with the rest of the gauges when the "short/problem" happens.

Dave
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Old Feb 26th, 08, 3:45 PM
undee70ss undee70ss is offline
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Default Re: Battery charger blows 20 amp fuse to HEI?

Quote:
Originally Posted by dscabra View Post
It looks like the hot wire is running directly from the HEI to the fuse block.

Dave
Where on the fuse block, which terminal????

Quote:
Originally Posted by dscabra
I have some sort of drain on my electrical system that has been an annoyance for the most part. As long as I start and drive the car fairly regularly, I don't have any problems. This year, the weather has been much colder than normal and I have found my car's battery dead more than I like
.

First find and correct this problem........

To test for the drain, disconnect any clocks and radio with memory, with the car off and everything turned off, disconnect positive battery cable and connect a test light inline between the cable and the battery (do not let the cable touch ground), with a drain the light will be lit. You need to make the light go out to find the drain. Disconnect things one at a time till the light goes out. First disconnect the alternator and voltage regulator plug, then fuses at the fuse box.

Quote:
Originally Posted by dscabra
Update:

I took the car out today and when I got on the throttle it looked like my entire electrical system was shorting out. I have digital gauges, which would cut off along with the stereo for a split second then come back on. The car continued to run, but at one point it stumbled during one of these episodes.

Could I have a loose ground wire someplace?
Yes or a poor conection in the main wiring. Check battery cables and connections (both pos and neg) and connections in main wiring, (junction block and horn relay) If you rule those 2 places out, could have a bad connection at firewall bulkhead connector.




Quote:
Originally Posted by dscabra
The first time I used it, I had the battery disconnected and everything worked just fine. The next two times I used it, I left the battery connected to and each time, the car failed to start after wards due to a blown fuse that feeds the HEI. Any ideas why this would be happening?
As for the fuse blowing, if the HEI is wired to IGN terminal at fuse box, that terminal should only have power when key is on. Is there anything else wired to that terminal? If the battery charger is blowing that fuse (should be the turn sig fuse) then something must be wired incorrectly and backfeeding that circuit. (need to answer which terminal you used first) This could also be causing your battery to drain also.
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  #8  
Old Feb 26th, 08, 8:15 PM
dscabra dscabra is offline
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Default Re: Battery charger blows 20 amp fuse to HEI?

undee70ss: Thank you for taking the time to offer such detailed help. I will try to work on the car this weekend if I can and will follow up here with any updates. As for the terminal that the HEI is connected to -- plugged into the bottom connector between the left and right fuse banks just above the 4A ignition fuse. There is another wire running from that plug, but i don't know were it is going.

Dave
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  #9  
Old Feb 27th, 08, 10:42 AM
undee70ss undee70ss is offline
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Default Re: Battery charger blows 20 amp fuse to HEI?

Quote:
Originally Posted by dscabra View Post
There is another wire running from that plug, but i don't know were it is going.

Dave
Does it look like a factory wire or a added wire. Do the drain test, if you have a drain, try disconnecting that wire.

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  #10  
Old Feb 27th, 08, 6:33 PM
dscabra dscabra is offline
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Default Re: Battery charger blows 20 amp fuse to HEI?

Quote:
Originally Posted by undee70ss View Post
Does it look like a factory wire or a added wire. Do the drain test, if you have a drain, try disconnecting that wire.

I am pretty sure the heavy yellow wire is running to my HEI, but I don't know where the pink wire is going.
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Last edited by dscabra; Mar 25th, 09 at 9:16 PM.
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  #11  
Old Mar 10th, 08, 11:17 PM
dscabra dscabra is offline
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Default Re: Battery charger blows 20 amp fuse to HEI?

Update - 3/10/2008:

Well, I haven't had a lot of free time lately, but today I started to try to figure out what is going on with my car. The battery was dead again, so this time I disconnected it and charged the battery. After reconnecting the battery, I started the car. It crancked right up and ran for a few seconds (typical when cold) and died. I pumped the gas a couple more times and tried to start it again, but guess what -- the fuse had blown again. After a few choice words and a trip to the auto parts store to get another pack of fuses, I did the following:

1. I disconnected the amplifier power lead from the battery
2. I disconnected the HEI wire along with the mystery wire from the fuse block
3. I ran a new wire from the HEI to the fuse block -- leaving the mystery wire disconnected
4. I replaced the blown fuse

After doing the steps above, I fired the car back up. All my gauges seem to functioning normally now and there were no "shoring episodes". So, now I need to track down what the mystery wire was feeding and attempt to reconnect my amplifier. I still need to try the drain test that was recommended previously, but things are looking up.

Dave
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  #12  
Old Apr 24th, 08, 10:24 PM
dscabra dscabra is offline
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Default Re: Battery charger blows 20 amp fuse to HEI?

Just to follow-up on this thread; I’ve been traveling a lot for work lately and trying to landscape our new home. I last fired my car on 3/10/2008 after replacing the ignition wire from the fuse block to the HEI and removing the mystery wire, but haven't had any time to mess with it since. Today (4/24/2008) I got off work early, so I went out to try to start the car. I fully expected to have a dead battery again, but much to my surprise it fired right up. It looks like the "mystery" wire that was spliced into my ignition wire was the culprit. Thanks to everyone who provided responses to my original post. I really appreciate it, and hope I can return the favor some day.

Thanks again to everyone --
Dave
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Old Apr 25th, 08, 1:25 AM
undee70ss undee70ss is offline
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Default Re: Battery charger blows 20 amp fuse to HEI?

Quote:
Originally Posted by dscabra View Post
Thanks to everyone who provided responses to my original post. I really appreciate it, and hope I can return the favor some day.

Thanks again to everyone --
Dave
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