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Old March 1st, 2018, 09:18   #1
Join Date: Feb 2018
Location: Gig Harbor Wachington
TDI(s): 98 Jetta
Default Voltage regulater

Got a 98 Jetta TDI,
Voltage regulater failed. Rebuilt alternator had trouble finding a regulator so I put in aftermarket. So when car starts after about 3 seconds gages stop working, radio goes black.... Iíve checked and rechecked and rechecked everything. Before I start tearing everything out again and order parts.... whatís going on?
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Old March 1st, 2018, 09:22   #2
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Join Date: Apr 2012
Location: Alberta Canada
TDI(s): 97 Vento
Fuel Economy: 46 mpg

Sounds almost like a bad ground to me. Likely somewhere from your battery if I had to guess. I just experienced voltage regulator issues on my alternator as well, but fortunately I haven't directly experienced this problem.
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Old March 1st, 2018, 15:46   #3
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Join Date: Mar 2011
Location: Northern MD
Fuel Economy: Race: 12mpg, Gandma:65mpg

return that junk part you got and buy an OEM, or rebuild yours. trust me on this, you have a 20-25% chance of that part working for more than 80K miles.
Also you do have a bad ground for your issue.

there is a thread on rebuilding them here, do a seach
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Old March 3rd, 2018, 08:02   #4
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Join Date: Nov 2005
Location: Kansas City Missouri
TDI(s): Jetta
Fuel Economy: 40

Once you go Bosch you never go back.
Richard. ASE Certified Master Auto-Technician with L1 Advanced Engine Diagnostic Rating. ATRA Certified in Rebuilding, Diagnosing & Installing Transmissions.

Now offering Malone Tunes!..............http://www.kansascitytdi.com/
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Old March 3rd, 2018, 08:50   #5
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Join Date: May 2003
Location: Southeast Kentucky

Check the voltage while the engine is running ... it may be over charging. I've seen them rolling out over 18 volts causing the cluster to totally shut-down.

But, obviously, as others have said, take that thing back while hopefully it is still under warranty!
'84 Vanagon '02 ALH TDI engine Malone Stage 1 tune. CAT, SS 2" exhaust, E-vac system, DMF with upgrade pilot shaft, 4.57 R&P, fan assisted IC. (32 to 35+ MPGs consistently)
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