Weird Stuff - Wiring and such...
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Freshman User
Joined: Jun 2007
Posts: 26
Likes: 0
From: Rossville, IN
Weird Stuff - Wiring and such...
Hey fella's. Bought a 97 HD 7.3 from my Uncle recently. He took pretty good care of it, but some weird things are going on.
1) Alternator was replaced within the last year, but at start up gauge shows low voltage. It does go up with RPM. Seems like it should always show normal.
2) Gooseneck trailer has all lights except running lights. Brakes, turn, flashers all good - no running (tail) lights. I have no voltage at truck connection when I test. Truck running lights work ok.
3) When I tap the brakes with my foot on accelerator, truck tranny does something weird, almost like convertor is locking up - I don't really know how to describe it.
4) Anyone else have trouble with rear spring hanger bracket rusting out? I just had to replace one that actually broke. 77' gmc is original, and shows no sign of wearing out!
Anyway, if ya'll got some time, I appreciate any help. Have a great weekend!
1) Alternator was replaced within the last year, but at start up gauge shows low voltage. It does go up with RPM. Seems like it should always show normal.
2) Gooseneck trailer has all lights except running lights. Brakes, turn, flashers all good - no running (tail) lights. I have no voltage at truck connection when I test. Truck running lights work ok.
3) When I tap the brakes with my foot on accelerator, truck tranny does something weird, almost like convertor is locking up - I don't really know how to describe it.
4) Anyone else have trouble with rear spring hanger bracket rusting out? I just had to replace one that actually broke. 77' gmc is original, and shows no sign of wearing out!
Anyway, if ya'll got some time, I appreciate any help. Have a great weekend!
Lead Driver
Joined: Mar 2006
Posts: 5,104
Likes: 1,521
From: western SD
1 If the engine is cold, the glow plugs are causing the low voltage. They can stay on for a short while.
2 Check the under hood fuses, ther is one for the running lights there.
3 I'm not an auto tranny guy so no help there.
4 If you live where they salt the roads in winter that is a common problem I'v read.
2 Check the under hood fuses, ther is one for the running lights there.
3 I'm not an auto tranny guy so no help there.
4 If you live where they salt the roads in winter that is a common problem I'v read.
Lead Driver
Joined: May 2007
Posts: 8,608
Likes: 13
From: Belair md
1. glow plugs can stay on for up to 120 seconds, low voltage during this period is normal.
2. the wires for the gooseneck are probably pigtailed into the main truck harness near the rear bumper, check the connections there.
3. the weird tranny thing you are feeling is exactly what you think it is, the torque converter clutch disenaging. this is normal
4. yes it is a flaw, they all rot out. the factory hangers are solid, the new replacements have a drain hole in them
2. the wires for the gooseneck are probably pigtailed into the main truck harness near the rear bumper, check the connections there.
3. the weird tranny thing you are feeling is exactly what you think it is, the torque converter clutch disenaging. this is normal
4. yes it is a flaw, they all rot out. the factory hangers are solid, the new replacements have a drain hole in them
Postmaster
Joined: Jun 2009
Posts: 3,420
Likes: 1
From: Maryland
X2 on the factory hangers rotting out it is common with the ones without a drain hole. Mine had a half inch of metal left holding the spring back. whooo If the bracket broke with my truck loaded down I would have had a nice sized dent in the bed.
