Eating Voltage Regs

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Eating Voltage Regs

Postby Douglas » Tue Sep 05, 2017 5:31 pm

My 1990 is eating voltage regs. I scoped the battery looking for a shorted diode in the 3-phase bridge, but saw nothing useful( liddle ripples, all the same size ). I tried measuring the voltage reg case to batt negative voltage and got a steady 39 mV( black lead to batt, red lead to reg's case ).

Am tempted to start throwing parts at it, but I'd rather just fix what's broken, yes?
1990 D250, NV5600, 16cm housing and PAC brake, Powr-Lok'd 3.07's, HX35...IC next

1991 D250, 727 and 16cm H1C.
fuel screw!!!!
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Re: Eating Voltage Regs

Postby laneends » Mon Sep 18, 2017 8:15 am

I got tired of that game pretty fast, I ran a new relay controlled by the old field exciting wire, and had an internal regulator installed in my alternator. problem free for two years now.
1990 D-250 with getrag 360: pyro, boost, volt, oil pressure, fuel pressure, and water temp gauges, hot screw, 366 gov spring, THD pin, M&H dynamic timing spacer, throttle linkage adjusted for full travel, 4" turbo back exhaust, THD's LPPLP, BHAF, south bend clutch. 2150rpm=60 mph. Needs more turbo so I can turn up the fuel.
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fuel screw!!!!
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Re: Eating Voltage Regs

Postby BobS » Mon Sep 25, 2017 5:31 am

Run a wire lead from one of the mounting screws of the voltage regulator to the engine or the alternator. Also run another lead from the negative battery post to the rad support. You live in Michigan. Your truck has been subjected to many years and miles of corrosion to the point where your grounding to the cab and the regulator may have become intermittent.

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91.5 W250 NV4500 Conversion
89 D350 Stock
92 W250 Crew Cab finally in progress
86 D150 wannabe 4BT
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14mm rotor
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