Custom Modifications

Generator to Internal Regulated Alternator
Conversion for 1958 to 1962 GM Cars
1958 to 1962 GM cars came equipped with generators. We can modify the new forward lamp harness (or the engine harness on Pontiac cars) you will be purchasing to accommodate a GM internal regulated alternator. We will add the proper wires and leave out the unnecessary wires, as required. Your new harness will retain a factory appearance. Installation is easy, just get rid of the generator, install the new internal regulated alternator, install the new horn relay and plug in the new harness. There is a $29.00 modification charge for this converting the forward lamp harness (or engine harness on Pontiac cars) and you will need to purchase a new horn relay Part # 12339243 $18.00.

Note: By modifying your new forward lamp harness, your generator light or ammeter gauge will no longer function correctly; unless a modification is also made to the dash harness. If you are purchasing a new dash harness, we can modify the new dash harness, so that the light or gauge will continue to function correctly. The modification charge is an additional $75.00.


External Regulated Alternator to Internal Regulated Alternator
Conversion for 1963 to 1972 GM Cars and Trucks

Most 1963 to 1972 GM cars and trucks came equipped with external regulated alternators. You may wish to convert over to a GM internal regulated alternator, as they are inexpensive and commonly available (external voltage regulators are becoming hard-to-find). We can modify the new harness you will be purchasing (either the engine or forward lamp harness, depending on year and model) to accommodate a GM internal regulated alternator. We will add the proper wires and leave out the unnecessary wires, as required. Your new harness will retain a factory appearance. Installation is easy, just get rid of the external voltage regulator, install the new internal regulated alternator and plug in the new harness. Your alternator light or ammeter gauge will continue to function correctly. Just let us know when ordering, that you will be using an internally regulated alternator. There is a $29.00 modification charge for this conversion.


External Regulated Alternator to Internal Regulated Alternator
Conversion Kit for 1963 to 1972 GM Cars and Trucks
If the harnesses in your car are in good shape, but you would like to get rid of your external regulated alternator and install an internal regulated alternator this kits for you. Easy to install: 1) Disconnect your external voltage regulator leads and plug in our "Special Regulator Adapter" to the regulator lead wires. 2) Disconnect your alternator lead wires. 3) Install new GM internal regulated alternator. 4) Plug in our "Special Alternator Adapter" to the alternator lead wires. That's really how simple it is. Part # 27555. Price $21.00. Includes both adapters and instruction sheet. We also offer free technical support if you can't figure it out.


Point Ignition to H.E.I. (Electronic Ignition)
Conversion for 1955 to 1974 GM Cars and Trucks

All of our 1955 to 1974 engine harnesses can be converted to work with GM H.E.I. distributors. We will add the proper wires and leave out the unnecessary wires, as required. Your new engine harness will retain a factory appearance. Installation is easy, just one (1) wire going to the H.E.I. distributor cap for power. Just let us know when ordering, that you will be using H.E.I.. There is a $24.00 modification charge for this conversion.

Note: This modification is for GM H.E.I. distributors only. If you are going to be using any other type of ignition system you will want to order your engine harness with no modifications. Most aftermarket ignition systems (MSD, Accel, Crane, Jacobs etc.), include adapter harnesses that allow their systems to work with stock engine harnesses.

 

If you have any questions or require a modification that is not listed, please call our Customer Service Department at (562) 926-9552.