weird electrical problem

[orly_andico]

i have this weird electrical problem which suddenly appeared after (1) my alternator belt was replaced; (2) i moved the CD changer cable around while putting some foam under the back seat.

basically, the HU dies under heavy electrical load. for example, high beam and A/C is on. if the RPM gets really low, or a signal light is engaged, or i roll down the window, the HU will *sometimes* turn off spontaneously. am not sure if the entire electrical system is affected, or just the HU.. but so far no other electrical parts are misbehaving.

i have already replaced my alternator with a 90A unit, and this problem didn't exist until the two events i've listed above. any ideas?

[ghosthunter]

maybe a short circuit in your electrical system?

[afrasay]

loose battery connection. ganito din nangyari sa akin after changing batteries. pag nag roll down/up sa ng window yun volt meter ko bumababa ng 8 volts pag nag wiper ganun din. pag galaw ko ng cable maluwag yun positive side.

[orly_andico]

checked my cables, they're tight. would it do any good to sand the battery posts? also, i don't have problems starting.

[afrasay]

orly:::check also the piggy wires (ground connected to the body)not only the clamps.

[orly_andico]

piggy wires.. wow that's the first time i've heard that

actually after tightening, the radio is far less likely to die on me. but it still dies. i've found a good way to trigger the behavior REPEATABLY:

1) car at idle
2) A/C blowing
3) high beams on
4) radio on

if i roll the window up/down, it's OK (radio don't die anymore). BUT: if the window is FULLY rolled up and i try to roll it up SOME MORE... radio dies every time, accompanied by a rougher engine note (my feeling is the added load on the alternator is fux0ring the engine idle).

[OTEP]

May guage dimmer ba ang 626? Dapat naka-set sa full parati. Kasi kapag naka-dim ang rheostat, mababa din ang voltage papuntang radio.

[afrasay]

puwersado ang power window motor pag sagad na ang taas kaya high current, although hindi normal ang mamatay ang radio or mag rough idle ang engine. if you have an ammeter you will see that mag discharge ang battery mo during this operation. try mo mag lagay ng separate ground recta mo sa body. see if this solves the problem.

[orly_andico]

hi alfred,

i just added an extra ground. :D dirty hands. what i've observed is the following: engine idle, high beam, A/C on high, hazard lights on -- the HU no longer turns off pag sinagad ko yung power window. lowering ALL FOUR windows at the same time, ok pa rin. but raising all four windows simultaneously.. ayun, patay ang HU.

don't know if medyo nagloloko yung surplus alternator na nakuha ko (to replace my old underpowered 65A unit), or if i need an even bigger alternator (the 626 stock alternator is 80A). or if it's a wiring problem somewhere. or.. kung di talaga kaya 4 windows at the same time..

[wildthing]

Can you try adding extra "wires" sa negative ng battery and attach it to the car's body...make sure metal contact (isand paper mo kung kinakaillangan)....it looks like a body ground problem.

Typical symptoms yung sinabi mo ng kulang sa body ground or a bit of a loose contacts sa ground...tumataas kasi ang resistance habang loose ang contacts. As you could see may improvement na when you tightened the bolts of the body ground.

or try mo mag lagay ng wire (lakihan mo ng kaunti) na direct from the battery terminal ground to the body ng radio mo....then test it again.

just my 2 cents.

[revoGSX]

better have the alternator checked.. baka po hindi kaya ng surplus alternator yung load.. pa-check po ninyo kung kaya niya talaga mag-bigay ng 90A continuous load .. hindi ko alam kung paano ito i-test.. baka sa mga battery stations eh libre..

kung meron po kayo tester eh check po ninyo yung battery voltage kung mag-drop ng less than 12volts..

sa pagkakaalam ko po eh... ang battery ang bahala sa pag-start ng engine ..then the alternator should take care of all your electrical components... check din po ninyo yung rpm.. it should not go below 800rpm with aircon off at 1000rpm with aircon on..

[Duke]

kung may marunong kayong Electrcian have it check.same thing happened to my cousins starex nagpalit ng head unit nya at pag nag high rev sya meron kang maririnig na ovious sound then yung windows nya kung pag pinagsabay nya itaas both side namamatay yung HU nya..may nilagay yung electrician na metal coil dun sa batery na parang ginawang ground(Noise suppesor tawag nila sa principle pero yung metal coil forget ko tawag dun tanong ko bukas)..nawala yung ingay ng HU nya pati yung prob nya sa windows nya

[Buzz]

Check mo grounding wires mo, dapat may grounding ka sa kaha and sa engine body, baka may loose connections

[afrasay]

mabigat kasi ang load sa alternator/battery when you are raising your windows as against when your lowering it. check your alternator baka overrated.

[orly_andico]

yeah.. the alternator is overrated at 90A since 80A yung stock. pero malaki yung difference sa idle when it kicks on. i'm pretty sure hindi 90A ang draw ng motors. anyway will have it checked this weekend.

[orly_andico]

also regarding RPM.. hindi 800-1000rpm ang idle. it's more like 600-700rpm no A/C, 700-750 with A/C. normal naman daw yun for this engine. pero malaki ang "roughness" ng engine when loaded yung alternator.. doesn't seem normal kaya pa-check ko na.