Why does my Oldsmobile 442 not charge at idle?

Short answer: When a 442 won't charge at idle, check the belt for glazing and tension, make sure the alternator pulley is the right size, clean the grounds, and test the separate voltage regulator. A new alternator alone may not fix it if one of those is the real cause. For loose steering, find where the play is before adjusting or replacing the steering box.

Symptom: The GEN light stays on at idle, voltage is low until you rev it, or the steering feels loose and wanders.

What to check first

1. Measure battery voltage at idle and at 1,500 rpm. Around 14 volts while running is normal.
2. Look for a shiny, glazed belt and check its tension.
3. Clean and tighten engine-to-body and battery grounds.
4. Test or swap the voltage regulator.
5. For steering play, have someone rock the wheel while you watch the box, joints and tie rods.

Likely causes

1. Glazed or loose alternator belt. A shiny, hardened belt slips at idle, so the alternator doesn't spin fast enough to charge.
2. Alternator pulley too large. A bigger pulley spins the alternator slower. At idle, it may not make enough current.
3. Poor grounds. Old cars need good grounds between the engine, body and battery for the charging system to work.
4. Separate voltage regulator. These cars use a voltage regulator box mounted apart from the alternator. When it fails, charging gets weak or stops.
5. Steering box needs adjusting or replacing. The steering box has an adjuster to take out slack. Worn parts elsewhere can also cause play.

What it usually costs

Owners in these threads didn't post prices.

Is it safe to keep driving?

Weak charging will eventually leave you stranded. Loose steering is a safety issue, so fix it before driving at speed.

DIY or shop?

Belts, grounds and a regulator swap are DIY. Steering box adjustment or replacement is best done by a shop or experienced DIYer.

Recalls, bulletins and complaints in plain words

• Related recalls: NHTSA lists these recalls touching this area of the Oldsmobile 442: 66V032003 (1967-1967 model years, steering: steering wheel/handle bar). Check your VIN at nhtsa.gov/recalls. If your car is part of this recall, the dealer fixes it for free.
• Plain words: The complaint count below shows how often owners reported problems that mention these words to NHTSA. A count is not proof of a defect.
• NHTSA complaints: 0 keyword-matched complaints for Oldsmobile 442 / Cutlass 1964–1972 (of 0 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-29; keywords: charg, alternator, generator, battery, steering) (NHTSA returned no data for 48 model-year queries). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In Original alternator for a 1968 442 on Car Talk, a 1968 442 owner had weak or no charging at idle after the car sat in storage, with the GEN light on. Members suggested checking for a glazed belt, the pulley size, grounds and the external voltage regulator.
• In Continued issues with 1968 Olds 442 Charging system, on Car Talk, the same 1968 442 owner kept chasing the charging problem and found the old alternator showed the same symptoms. No final fix was posted in the thread.
• In More advice on my 1968 Olds 442 on Car Talk, the owner wanted to fix the 442's loose steering. Members said to first find where the play is, then adjust the steering box or swap in a quicker-ratio box.

Quick tip

Before buying another alternator, test the regulator and grounds. On these cars, those are often the weak link.

Vehicle focus: Oldsmobile 442, 1964-1972 (an option package on the Cutlass in some years).

Safety / mechanic note

Steering is a safety item. Verify with a mechanic.