Author Topic: DIY bypass the charge lamp  (Read 2338 times)

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Offline Largewon62

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DIY bypass the charge lamp
« on: February 18 2017, 02:02:31 PM »
 I am looking for a way to bypass the unreliable charge lamp circuit that is preventing charging on my 1987 Grand National.  I know that there is a way to excite the field using a wire from the waste gate solenoid, but have not found a definitive guide to doing it.

 Any tips would be appreciated.

Offline TexasT

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Re: DIY bypass the charge lamp
« Reply #1 on: February 18 2017, 05:37:59 PM »
I'm all for the diy approach but I doubt you could buy the pigtails for what casper charges.
http://www.casperselectronics.com/cart/index.php?route=product/product&path=7_53_54_10_14&product_id=604It it was a no brainer for me to just send them the money.
Rich

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Offline daveismissing

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Re: DIY bypass the charge lamp
« Reply #2 on: February 18 2017, 06:07:54 PM »
I'm trying to remember if its the low side or the high side of that solenoid that is PWM'd.
A  ~470 ohm resistor to  a switched 12v source was the basic field fix, wasn't it?
-Drain plug by Earl Brown, custom oil pan by Rich's Auto

Offline Largewon62

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Re: DIY bypass the charge lamp
« Reply #3 on: February 18 2017, 06:08:46 PM »
 Thanks for that info. I am aware of the Caspers harness, but I work in the gas fireplace industry and with the unseasonably warm winter we've had, I must mind my pennies until my summer gig starts. At almost $60 shipped, I'd like to make my own if I can.

 I thought it was as simple as running a wire from the "i" terminal on the alternator to a switched 12v source like the waste gate solenoid?

Offline Steve Wood

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Re: DIY bypass the charge lamp
« Reply #4 on: February 18 2017, 06:46:41 PM »
No, it needs a resistor in the line to drop the voltage a little.  Otherwise, the alternator won't last too long.  You can also just wire a instrument panel light bulb in series with the switched 12 volt feed.
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Offline daveismissing

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Re: DIY bypass the charge lamp
« Reply #5 on: February 18 2017, 07:40:41 PM »
Looked at the diagram-The ECM controls the ground/low side so the other terminal is 12v
-Drain plug by Earl Brown, custom oil pan by Rich's Auto

 

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