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Old 12-27-2016, 09:00 PM   #1
davem815
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Join Date: Jun 2013
Location: Warren, IN
Posts: 313
Need help, 70 GMC not charging

'70 GMC 307 with external voltage regulator and optional gauges in the dash cluster.

Truck quit charging, dies if I remove positive battery terminal
It has ran fine for a year and a half. PO replaced alternator within a year of selling truck to me. I had alternator checked at an alternator/starter shop and it tested fine. I replaced EVR. No change.

I have no voltage at F terminal of EVR with or without engine running. Amp gauge on dash points straight up (half way between D and C) with or without engine running. If I jump 12v from battery to F terminal on EVR, amp gauge goes to 3/4 Mark (toward C).

My research says F terminal should have around 3-4 volts with key on, engine off and 12-14 volts with engine running. I followed blue and Brown wires from alternator to EVR to firewall and did not see any breaks or splices.

What could cause no voltage at F terminal?

Thanks in advance for your help, Dave
__________________
1966 GMC 1500 (3/4 ton) Custom V6 3sp Edna
1970 GMC C2500 Deluxe lwb 307/4sp Ol' Green
1971 Chevy C20 Custom lwb 307/3OTT, now a project in family since 1974
2014 GMC K2500 Crewcab 6.0 gas
2005 GMC Canyon Ext cab 4wd daily driver
1963 F*rd/Howe C750 fire truck 11,000 miles
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