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06-06-2012, 04:17 PM
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Registered User
Join Date: Nov 2011
Location: Valparaiso, Indiana
Posts: 195
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Converted Alternator
Has anyone switched from a 3 wire alternator to a 1 wire and had the factory Volt (not ampmeter) guage work? I tried to hook the plug into the new alternator connector and no voltage shows on the guage. I know the side plug shouldnt really do anything on the alternator being a 1 wire. I know its charging with a DVOM hooked up. Checked fuses and they are ok, original alternator hooked up shows voltage. Any thoughts on how to make the guage work again? Its a 1978 GMC Sierra Grande by the way. Thanks!
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06-06-2012, 04:39 PM
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#2 |
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Registered User
Join Date: Nov 2011
Location: Valparaiso, Indiana
Posts: 195
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Re: Converted Alternator
I have searched other threads and it leaves me confused. Is there a simple way to make it work is what im asking.
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06-07-2012, 11:24 AM
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#3 |
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Moderator
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,933
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Re: Converted Alternator
Did it come from the factory with gauges?
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1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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06-07-2012, 11:53 AM
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#4 |
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Registered User
Join Date: Nov 2011
Location: Valparaiso, Indiana
Posts: 195
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Re: Converted Alternator
Yes it has volt, oil press, water temp, and clock...all factory
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06-07-2012, 10:21 PM
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#5 |
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Registered User
Join Date: Dec 2009
Location: monett, mo
Posts: 230
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Re: Converted Alternator
i'll grant you, mine's an 88 and i did a complete engine swap, but my 1 wire alt tees into the battery cable and the starter. the gage gets its voltage signal from one of the 2 wires that go on the starter. i believe the 2 wires are pink. one goes to the terminal on the firewall right next to the brake booster, and i'm forgetting where the other one goes. hope this info somehow helps.
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06-07-2012, 11:28 PM
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#6 |
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Moderator
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,933
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Re: Converted Alternator
If it's a factory gauge panel then the volt gauge shouldn't be affected by the alternator wiring at all.
Do any of the other gauges work? Are any other circuits dead when that shouldn't be? What have you done with the two field wires and plug? I'm curious why you installed a one-wire alternator.
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1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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06-07-2012, 11:34 PM
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#7 |
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Registered User
Join Date: Nov 2011
Location: Valparaiso, Indiana
Posts: 195
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Re: Converted Alternator
I don't have the others hooked up. The fuel level works and all the lighting works. I swapped the cab and engine but hooked all the wires back up that were in the engine bay. I have a 1 wire cause it sees little street use and has a large load at idle. As for the field wires and plug, they are taped up and not used since it is 1 wire.
Posted via Mobile Device
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06-08-2012, 12:29 AM
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#8 |
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Registered User
Join Date: Jun 2012
Location: Lincoln ne
Posts: 6
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Re: Converted Alternator
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06-08-2012, 12:33 AM
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#9 |
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Registered User
Join Date: Jun 2012
Location: Lincoln ne
Posts: 6
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Re: Converted Alternator
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06-08-2012, 12:42 AM
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#10 |
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Registered User
Join Date: Jun 2012
Location: Lincoln ne
Posts: 6
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Re: Converted Alternator
I think a quick test to make sure your cluster/gauges still has power would be to take green temp gauge wire from between the #1 & #3 cylinders and ground it that should make the temp gauge peg to the 260* side if that does nothing I would check the fuses then the wiring behind your clust for loose connections or ground wires not attached
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06-08-2012, 01:09 AM
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#11 |
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Registered User
Join Date: Nov 2011
Location: Valparaiso, Indiana
Posts: 195
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Re: Converted Alternator
Ok, I will give that a shot. Thanks for your help guys!
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06-09-2012, 12:16 AM
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#12 |
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Registered User
Join Date: Nov 2011
Location: Valparaiso, Indiana
Posts: 195
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Re: Converted Alternator
Ok, I figured it out. I tapped on the guage and BOOM, it started reading. Removed the cluster and cleaned the connections and now it works. Thanks for all your help guys!
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