05-08-2019, 05:25 AM
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#1
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Junior Member
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Join Date: Jun 2008
Location: Mass
Age: 34
Posts: 10
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Junior Member
Join Date: Jun 2008
Location: Mass
Age: 34
Posts: 10
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Charging system spikes
Hey guys! I've learked around the forums for quite a while and never really had any issues with my 4runner... until today. The voltage at my ecu and at the battery will jump erratically from 12ish volts all the way up to 17 then randomly settle itself around 13.7. I've replaced the alternator thinking the regulator was on it's way out but that didnt fix squat. As you can see from the picture it'll go crazy then settle down and then spike up again. Starting doesnt seem to be a problem nor does heavy power draw. Any ideas guys?
Thank you!
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05-08-2019, 05:51 AM
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#2
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Junior Member
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Join Date: Jun 2008
Location: Mass
Age: 34
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Junior Member
Join Date: Jun 2008
Location: Mass
Age: 34
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Heres another image after going for a longer drive. I'm thinking it may be a dead cell in the battery? It's only a year or so old but it's not the best.
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05-08-2019, 06:25 AM
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#3
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Elite Member
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Join Date: Sep 2005
Location: Oakland CA
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Elite Member
Join Date: Sep 2005
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could be both, but check all terminals. including the alternator also.
then start the cheapest swap, which is the fuse, that 7.5 amp fuse i think, then the battery, then the alternator again. check all the wires first tho.
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Pioneer DEH-80PRS,Rockford Fosgate T600-2,Hertz ML 1650.3(2 pairs),T400-2,Hertz ML 280.3(2 pairs),T1000-1bdcp,(2)JL Audio 12W6v3, Mechman 240a HO Alternator, Dual Northstar 31m,Borla Dual Exhaust,AFE Magnumforce intake.Enkei WT-4 Michelin Defender LTX 275/55R20. retrofitted S2000 projectors,Philips 85122 White Vision,Morimoto 5Five Ballast.Diode Dynamics SS3 Yellow Fog Sport.2 pairs of Hella Supertones.Full led conversion on interior and exterior.HAWK Talon Rotors and LTS pads F+R,Stoptech stainless steel lines F+R.Bilstein 5100 @0.85, MOOG FJ Springs front,Bilstein B12 36-281824 rear .
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05-08-2019, 08:22 PM
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#4
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Junior Member
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Join Date: Jun 2008
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Junior Member
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So I did a few checks today. Voltage drop across body to batt, alt to batt, and engine to batt all have very low voltage drop numbers (less than .04) I did notice the voltage at the battery at idle is 14.5ish and the ecu reads around a volt less.
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05-09-2019, 08:49 AM
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#5
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Elite Member
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Join Date: Sep 2005
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now is this with hot reading or cold reading?
i know with cold they alternator can push out over 14 volts.
at hot idle it should be in the 13.4-13.8?
i really cant tell you since im using a high output alternator.
do you have a extra battery around that you can swap out? any group 24f or 27f is a drop in.
you can drop in a h7 h8 or h9 in, itll be short in height.
had an oddy pc1700mjt back then.
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Pioneer DEH-80PRS,Rockford Fosgate T600-2,Hertz ML 1650.3(2 pairs),T400-2,Hertz ML 280.3(2 pairs),T1000-1bdcp,(2)JL Audio 12W6v3, Mechman 240a HO Alternator, Dual Northstar 31m,Borla Dual Exhaust,AFE Magnumforce intake.Enkei WT-4 Michelin Defender LTX 275/55R20. retrofitted S2000 projectors,Philips 85122 White Vision,Morimoto 5Five Ballast.Diode Dynamics SS3 Yellow Fog Sport.2 pairs of Hella Supertones.Full led conversion on interior and exterior.HAWK Talon Rotors and LTS pads F+R,Stoptech stainless steel lines F+R.Bilstein 5100 @0.85, MOOG FJ Springs front,Bilstein B12 36-281824 rear .
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05-09-2019, 09:33 AM
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#6
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Junior Member
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Join Date: Jun 2008
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Junior Member
Join Date: Jun 2008
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I took these readings cold. I already swapped it with a new battery and same thing. After I swapped it, charge light stays on, the system sees a steady 13.5ish hot and then eventually goes haywire spiking up to 17 on the ecu side. When I'm done at work I want to probe some of the fuses as well as the signal wires from the alternator and see if I can see the voltage drop anywhere.
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05-09-2019, 04:39 PM
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#7
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Join Date: Feb 2018
Location: Arizona
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Real Name: George
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Member
Join Date: Feb 2018
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I would check all your grounds. Make sure they're tight. Giving them a good clean wouldn't hurt either to ensure good metal to metal contact.
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05-10-2019, 07:34 AM
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#8
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Junior Member
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Join Date: Jun 2008
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Junior Member
Join Date: Jun 2008
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Figured out what it was testing wires from the alternator. The white wire from the alternator broke inside the harness. After replacing that everything worked great. Thanks for the help guys!
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05-12-2019, 08:57 PM
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#9
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Elite Member
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Join Date: Sep 2005
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Elite Member
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Quote:
Originally Posted by Tangonator
Figured out what it was testing wires from the alternator. The white wire from the alternator broke inside the harness. After replacing that everything worked great. Thanks for the help guys!
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well at least its fixed now and you have a fresh new battery too.
__________________
Pioneer DEH-80PRS,Rockford Fosgate T600-2,Hertz ML 1650.3(2 pairs),T400-2,Hertz ML 280.3(2 pairs),T1000-1bdcp,(2)JL Audio 12W6v3, Mechman 240a HO Alternator, Dual Northstar 31m,Borla Dual Exhaust,AFE Magnumforce intake.Enkei WT-4 Michelin Defender LTX 275/55R20. retrofitted S2000 projectors,Philips 85122 White Vision,Morimoto 5Five Ballast.Diode Dynamics SS3 Yellow Fog Sport.2 pairs of Hella Supertones.Full led conversion on interior and exterior.HAWK Talon Rotors and LTS pads F+R,Stoptech stainless steel lines F+R.Bilstein 5100 @0.85, MOOG FJ Springs front,Bilstein B12 36-281824 rear .
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