Guest gikoro23 Posted November 25, 2006 Share Posted November 25, 2006 i am having an issue with my amperage dropping while at night with my lights on. after i pull up to a red light and my cars rpm goes down to around 850 or 900 (normal). then my lights dim and my amperage drops... i replaced my altinator and voltage regulator and now im out of ideas. i thinking it is the "shunt" from what i read in my haynes manual but i realy am stumped. does anyone have an idea. thanks, gikoro Quote Link to comment Share on other sites More sharing options...
waynekarnes Posted November 25, 2006 Share Posted November 25, 2006 trouble may not be with the alternator or regulator. but 1st, for some reason, datsuns like the regulator and alternator changed in tandem. been fooling with datsuns since 1972. experience has taught me, when using an external regulated alternator on ANY datsun/nissan always replace the alternator and the voltage regulator at the same time. not a week later, at the same time. for what ever reason, the new alt takes out the reg, new reg takes out the alternator. that said. datsun really screwed up the wiring in the z cars. everything goes through the amp guage, the light switch and then the fuse panel. large white wire to the amp guage. most problems with the lights are with the fuse box. the clips holding the fuses are press fit and riveted. corrosion builds between the two pieces of metal, metal gets hot, amps to headlights drops. suggest you check the fuse box. also suggest you use a couple relays on the headlights. instead of running all the voltage through the switch, high amp voltage sits waiting at the relay. low amp goes to the switch, turn sw on, low volt turns relay on, high voltage flows to the head lamps. if you are certain there is nothing wrong at the fuse box or with the wiring, you may want to upgrade to an internally regulated 280zx alternator. be a good idea to do anyway. some people are upgrading to the 70 amp GM alternator. Quote Link to comment Share on other sites More sharing options...
Dtsnlvrs Posted November 25, 2006 Share Posted November 25, 2006 i am having an issue with my amperage dropping while at night with my lights on. after i pull up to a red light and my cars rpm goes down to around 850 or 900 (normal). then my lights dim and my amperage drops... i replaced my altinator and voltage regulator and now im out of ideas. i thinking it is the "shunt" from what i read in my haynes manual but i realy am stumped. does anyone have an idea. thanks, gikoro This is normal for an externally regulated alternator Quote Link to comment Share on other sites More sharing options...
Guest gikoro23 Posted November 25, 2006 Share Posted November 25, 2006 sounds like ill switch to a internaly regulated alternator. is there a link on the wiring, and, or for the 70amp gm one. Quote Link to comment Share on other sites More sharing options...
Dtsnlvrs Posted November 25, 2006 Share Posted November 25, 2006 sounds like ill switch to a internaly regulated alternator. is there a link on the wiring, and, or for the 70amp gm one. I would suggest a search for "alternator upgrade" or something like that...I think someone was selling a plug -n- play adapter that allowed the use of a 280zx alternator....cant remember if it was on here or just on CZC. Quote Link to comment Share on other sites More sharing options...
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