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Electrical draw on new resto,,,,where to start,,,
#2956040
08/21/21 04:55 PM
08/21/21 04:55 PM
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Joined: Aug 2004
Posts: 2,092
New Mexico
JMCFAN
OP
top fuel
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OP
top fuel
Joined: Aug 2004
Posts: 2,092
New Mexico
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Newly restored 70 RR, Runs great,,,,but, I have a 5.4 amp draw on battery when measured at the neg battery terminal when car is off, Have pulled individual fuses with no change, where should I start? Freshly painted....so grounding issue?
68 Charger 383/ AT Green/Green VT
70 Roadrunner 383/4sp Purple/Black VT
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Re: Electrical draw on new resto,,,,where to start,,,
[Re: JMCFAN]
#2956050
08/21/21 05:20 PM
08/21/21 05:20 PM
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Joined: Feb 2003
Posts: 8,671
Andrewh
master
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master
Joined: Feb 2003
Posts: 8,671
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restored, or resto modded?
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Re: Electrical draw on new resto,,,,where to start,,,
[Re: JMCFAN]
#2956051
08/21/21 05:21 PM
08/21/21 05:21 PM
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Joined: Jun 2003
Posts: 21,427
It's a dry heat
gtx6970
Too Many Posts
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Too Many Posts
Joined: Jun 2003
Posts: 21,427
It's a dry heat
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Car all stock build?
If so, ck the alternator
Glovebox light, key in cylinder light etc etc
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Re: Electrical draw on new resto,,,,where to start,,,
[Re: JMCFAN]
#2956053
08/21/21 05:25 PM
08/21/21 05:25 PM
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Joined: Oct 2005
Posts: 270
Anchorage, Alaska
metallicareload
enthusiast
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enthusiast
Joined: Oct 2005
Posts: 270
Anchorage, Alaska
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 Unplugging harnesses until it goes away will help narrow it down
440, 4-Speed, 3.54
1968, when Dinosaurs ruled the Earth
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Re: Electrical draw on new resto,,,,where to start,,,
[Re: BigBlockMopar]
#2956070
08/21/21 05:56 PM
08/21/21 05:56 PM
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Joined: Nov 2003
Posts: 2,937
GA
roadrunninMark
master
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master
Joined: Nov 2003
Posts: 2,937
GA
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Also check starter relay / starter, things that are wired "hot most of the time" w/o the key on. If no luck there, pull each fuse one at a time. Should be able to check draw at battery or jumping the fuse blade ends at the box to see if there is draw or not.
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Re: Electrical draw on new resto,,,,where to start,,,
[Re: JMCFAN]
#2956074
08/21/21 06:04 PM
08/21/21 06:04 PM
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Joined: Jan 2003
Posts: 25,786
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,786
Rio Linda, CA
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Disconnect the wire from the alternator BAT lug.
The INTERNET, the MISinformation superhighway
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Re: Electrical draw on new resto,,,,where to start,,,
[Re: roadrunninMark]
#2956097
08/21/21 07:09 PM
08/21/21 07:09 PM
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Joined: Aug 2004
Posts: 2,092
New Mexico
JMCFAN
OP
top fuel
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OP
top fuel
Joined: Aug 2004
Posts: 2,092
New Mexico
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Also check starter relay / starter, things that are wired "hot most of the time" w/o the key on. If no luck there, pull each fuse one at a time. Should be able to check draw at battery or jumping the fuse blade ends at the box to see if there is draw or not. I did pull each fuse....no change
68 Charger 383/ AT Green/Green VT
70 Roadrunner 383/4sp Purple/Black VT
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Re: Electrical draw on new resto,,,,where to start,,,
[Re: John_Kunkel]
#2956098
08/21/21 07:10 PM
08/21/21 07:10 PM
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Joined: Aug 2004
Posts: 2,092
New Mexico
JMCFAN
OP
top fuel
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OP
top fuel
Joined: Aug 2004
Posts: 2,092
New Mexico
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Disconnect the wire from the alternator BAT lug. What should I look for there,,,,?
68 Charger 383/ AT Green/Green VT
70 Roadrunner 383/4sp Purple/Black VT
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Re: Electrical draw on new resto,,,,where to start,,,
[Re: JMCFAN]
#2956118
08/21/21 08:38 PM
08/21/21 08:38 PM
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Joined: Jan 2003
Posts: 15,350
Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,350
Omaha Ne
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Disconnect the wire from the alternator BAT lug. What should I look for there,,,,? if the draw gores away you may have an alternator partially shorting. DO KEEP THE BATTERY DISCONNECTED while the car is unattended 
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Re: Electrical draw on new resto,,,,where to start,,,
[Re: TJP]
#2956239
08/22/21 11:14 AM
08/22/21 11:14 AM
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Joined: Aug 2004
Posts: 2,092
New Mexico
JMCFAN
OP
top fuel
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OP
top fuel
Joined: Aug 2004
Posts: 2,092
New Mexico
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Couple of checks this morning
Batt lead to Alternator pulled-
Headlight Switch
High/low beam switch.
Draw still there,,,,with a fully charged battery it is 7 amps,,,,,,
68 Charger 383/ AT Green/Green VT
70 Roadrunner 383/4sp Purple/Black VT
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Re: Electrical draw on new resto,,,,where to start,,,
[Re: JMCFAN]
#2956240
08/22/21 11:22 AM
08/22/21 11:22 AM
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Joined: Jan 2011
Posts: 15,859
Central Florida
larrymopar360
Stud Muffin
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Stud Muffin
Joined: Jan 2011
Posts: 15,859
Central Florida
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Sure there's nothing else wired hot through a switch? Fog lights?
Facts are stubborn things.
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Re: Electrical draw on new resto,,,,where to start,,,
[Re: larrymopar360]
#2956243
08/22/21 11:34 AM
08/22/21 11:34 AM
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Joined: Aug 2004
Posts: 2,092
New Mexico
JMCFAN
OP
top fuel
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OP
top fuel
Joined: Aug 2004
Posts: 2,092
New Mexico
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Sure there's nothing else wired hot through a switch? Fog lights? No all stock build,,,,and all new harness from Year One ( M&H)
68 Charger 383/ AT Green/Green VT
70 Roadrunner 383/4sp Purple/Black VT
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Re: Electrical draw on new resto,,,,where to start,,,
[Re: larrymopar360]
#2956245
08/22/21 11:35 AM
08/22/21 11:35 AM
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Joined: Jan 2003
Posts: 10,713
North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,713
North Dakota
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What specifically are you using to measure the current? That seems high with no light visibly on and no motors running. If this is a stock setup what are the high current consuming devices, assuming that something hasn't failed?
1) ignition
2) A/C clutch
3) heater blower motor
4) headlights
5) rear window defogger
6) power windows
7) horn
8) windshield wiper
There just aren't that many devices that can draw that kind of current constantly and not have some kind of problem show up.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Electrical draw on new resto,,,,where to start,,,
[Re: 6PakBee]
#2956253
08/22/21 12:09 PM
08/22/21 12:09 PM
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Joined: Jun 2003
Posts: 21,427
It's a dry heat
gtx6970
Too Many Posts
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Too Many Posts
Joined: Jun 2003
Posts: 21,427
It's a dry heat
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What specifically are you using to measure the current? That seems high with no light visibly on and no motors running. If this is a stock setup what are the high current consuming devices, assuming that something hasn't failed?
1) ignition
2) A/C clutch
3) heater blower motor
4) headlights
5) rear window defogger
6) power windows
7) horn
8) windshield wiper
There just aren't that many devices that can draw that kind of current constantly and not have some kind of problem show up. Agreed that kind of draw is huge and not see anything on. Nothing on these cars back then had a key off draw except maybe time delay lighting for key switch
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Re: Electrical draw on new resto,,,,where to start,,,
[Re: Andrewh]
#2956281
08/22/21 12:52 PM
08/22/21 12:52 PM
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Joined: Aug 2004
Posts: 2,092
New Mexico
JMCFAN
OP
top fuel
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OP
top fuel
Joined: Aug 2004
Posts: 2,092
New Mexico
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I don't think you answered. is this a stock restoration or have you modded it? any modern features or added items that wouldn't be stock for that year?
how are you measuring amps drawn? Stock resto..with all new harness from Year One ( M&H) .only mod would the the upgraded digital tach added to the original Tic Toc tac which doesnt work,..... Measuring with Fluk meter at the neg battery cable
68 Charger 383/ AT Green/Green VT
70 Roadrunner 383/4sp Purple/Black VT
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Re: Electrical draw on new resto,,,,where to start,,,
[Re: 6PakBee]
#2956285
08/22/21 12:55 PM
08/22/21 12:55 PM
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Joined: Aug 2004
Posts: 2,092
New Mexico
JMCFAN
OP
top fuel
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OP
top fuel
Joined: Aug 2004
Posts: 2,092
New Mexico
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What specifically are you using to measure the current? That seems high with no light visibly on and no motors running. If this is a stock setup what are the high current consuming devices, assuming that something hasn't failed?
1) ignition works fine.....?
2) A/C clutch none
3) heater blower motor- have not check yet....its not running
4) headlights pulled switch cable-no change
5) rear window defogger none
6) power windows none
7) horn works fine
8) windshield wiper have not checked motor is a Jules rebuild...but does not work...will pull switch cable to test next
There just aren't that many devices that can draw that kind of current constantly and not have some kind of problem show up.
Last edited by JMCFAN; 08/22/21 12:56 PM.
68 Charger 383/ AT Green/Green VT
70 Roadrunner 383/4sp Purple/Black VT
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Re: Electrical draw on new resto,,,,where to start,,,
[Re: JMCFAN]
#2956297
08/22/21 01:10 PM
08/22/21 01:10 PM
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Joined: May 2019
Posts: 6,241
nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,241
nowhere
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What specifically are you using to measure the current? That seems high with no light visibly on and no motors running. If this is a stock setup what are the high current consuming devices, assuming that something hasn't failed?
1) ignition works fine.....?
2) A/C clutch none
3) heater blower motor- have not check yet....its not running
4) headlights pulled switch cable-no change
5) rear window defogger none
6) power windows none
7) horn works fine
8) windshield wiper have not checked motor is a Jules rebuild...but does not work...will pull switch cable to test next
There just aren't that many devices that can draw that kind of current constantly and not have some kind of problem show up. You are making assumptions when you say "works fine". Something is not working fine and until you physically disconnect EACH item on the list and check you cannot assume it "works fine". For example, your ignition could very well draw 7 amps in use, but is still drawing current when it should be off. So while it make "work fine" in start and run, it should not be drawing current at all in off. Until you disconnect it you won't know.
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