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P38 (1998) pulsing lights

3770 Views 8 Replies 4 Participants Last post by  kcv2550
Hi, I wonder if anyone can help diagnose the following problem on a P38 1998 4.6 HSE ?

Basically the lights (and I mean all lights / electrical functions) pulse, inlcuding interior lights HVAC panel etc. This is a slow pulse, ie does not seem to be related to engine revs. It started recently after a head gasket change.

The battery charge seems good (measured across the battery gives about 14.2-14.6v), and the vehicle has no problems starting or holding charge / used as my daily vehicle both day and night and performs great.

I would guess that it would seem to be the alternator (or perhaps the recitifier ?) but I dont really want to jump in and replace it without checking other possibilities first.

Any ideas ?

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cable conection..

:shifty: It seams they forgot to clean the ground cable well or worst they just forgot to connect it check this and this might fix
all your problems .
poor connections

I read this info on the web it might help even more .(all data web )

Intermittent And Poor Connections

Most intermittent problems are caused by faulty electrical connections or wiring. A sticking relay or solenoid can also be a problem. When diagnosing intermittent problems, check the following items:

1. Poor mating of connector halves.

2. Terminals not fully seated in the connector body (terminal backed out).

3. Dirt or corrosion on the terminals. The terminals must be clean and free of any foreign material.

4. Improperly formed or damaged terminals.

All connector terminals in problem circuits should be checked carefully to ensure good contact tension (Figure 1). Use a corresponding mating terminal to check for proper tension.

5. Poor terminal to wire connection.
Examples of this are poor crimps, poor solder joints, crimping over wire insulation rather than the wire itself and corrosion in the wire to terminal contact area (Figure 1).

6. Wire insulation which is rubbed through, Causing an intermittent short as the exposed area touches other wiring or parts of the vehicle.

7. Wiring that is broken inside the insulation.

8. Corroded wiring inside the insulation.
Both the conductor and insulator must be free of any corrosive damage to ensure good conductivity.


Upon customer complaint for the symptoms outlined, perform the specified repairs.


No specific parts apply to these inspections and repairs. Individual connectors may be needed.


Perform the diagnostic procedures and repairs outlined in the following pages for troubleshooting and repair of poor connections.

CAUTION: 1. Use a high impedance (10 megohms or higher) digital multimeter for troubleshooting.

2. When disconnecting a connector, pull on the connector halves. Do not pull on the wires to the connector.

3. Gold-plated terminals must not be mated with tin-plated terminals.
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alternator ???

Is there a way that someone could lend you an alternator ???it would be wiser to try this before, because I am not very sure that the problem comes from the alternator ,and it is expensive to change it for nothing , did you clean very well the fuse compartment in the engine right part, next to the water tank ?? change fuses from one socket to another ( respecting the fuse capacity and specification )and also the fuse box under the right seat . keep me informed ,I am looking in my two cars other possibilities ok . I will let you know if anything new comes up and you to O.K.
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