If your Kombi has a factory-fitted auxiliary battery then you can pick up an engine-run signal from the split charge relay (SCR) trigger wire (the thin grey wire shown in the pictures below). This wire connects to the SCR via the small plug (shown disconnected from the SCR).
If your Kombi has a factory-fitted auxiliary battery then you can pick up an engine-run signal from the split charge relay (SCR) trigger wire (the thin grey wire shown in the pictures below). This wire connects to the SCR via the small plug (shown disconnected from the SCR).
On my last van (t5) I simply put the B2B in series with the SCR. I.e. took the output from the SCR to the input of the B2B and output of B2B to battery. The SCR acted as an ignition controlled supply to the B2B, and the B2B did the charging magic. When I sold the van, it was a simple job to put it back to factory spec.
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