Fred the Farmer

hey all,

well i put a new alternator on my 90 w250, because it stopped chargeing, well now the new one isn't charging. So i got it checked and it was pushing 15 volts so it was fine, but then i thought the external regulator. I replaced that and still no charge. Any help is appreciated.

thanks
garrett

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1992 Dodge Cummins 4x4 3/4 ton Regular cab long box with some Go fast Goodies.

bumpytruck

Be sure the firewall were the regulator attaches is clean.because the regulator housing needs to be grounded.And I have had bad "new" regulators before

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1991 350, flatbed-standard cab, 4wd, auto,drw,I/C,straight pipe,16cm housing and BHAF, with a old smoky copy. Bumpytruck II, 2005-3500 DRW,SLT,Q/C,Auto, 4X4 Patriot blue ,spray in liner, Hers 07 GMC Yukon XL Ours 06 35' Sandpiper 5er

Fred the Farmer

ok will do

JBradley500

i've had bad new regulators too. i have all new parts under the hood of my ford except i have a 1982 regulator because the new one was junk out of the box.

Fred the Farmer

o wow that sucks i hate when that happens

Santaclaus

Check the fusible link. If you are pushing 15 V at the alternator to me that means the alternator is not seeing the battery. Check your wiring from the alternator all the way to the battery, right behind the battery should be fusible like. You can also read voltage for the field across the two small terminals on the back of the alternator, this will tell you if the voltage regulator is working or not. The higher the voltage here the more their regulator wants from the alternator.

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92, Extended cab, auto trans, exhaust, boost, tack, oil pressure gauges. Pensacola, Fl.

Fred the Farmer

ok i will do that thanks sir

deking1970

Does a '90 have a crank position sensor? I had some wires break on mine do to a bad fan belt and it caused mine to quit charging.

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My Truck: 1985 Crew 4wd LWB with 1993 CTD running gear, 3400 rpm spring, BHAF, Smoke screw flush fuel screw adjusted, timing questionable, fuel pin turned, 4inch turbo back, to 6 inch stacks. Heated leather seats from an '01 quad cab. Alcoa Classics.
Company Truck: 1985 Crew 2wd Dually With 1991 CTD running gear 4" straight piped exhaust.

Dad's Truck: 1998 Quad Cab Dually 4x4 w/ 12v Cummins and automatic.

Dad's Other Truck: 1994 Reg cab 4x4 w/12v Cummins and 5 speed.

Fred the Farmer

well i fixed it, turn out the battery has to have 12.2 volts before it can turn the exciter on the regulator on to charge the battery it was a pain to figure out.